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90cd366bc6
Drivers might try to access and run enable_source and disable_source handlers when the driver that implements these handlers is clearing the handlers during its unregister. Fix the following race condition: process 1 process 2 request video streaming unbind au0828 v4l2 checks if tuner is free ... ... au0828_unregister_media_device() ... ... (doesn't hold graph_mutex) mdev->enable_source = NULL; if (mdev && mdev->enable_source) mdev->disable_source = NULL; mdev->enable_source() (enable_source holds graph_mutex) As shown above enable_source check is done without holding the graph_mutex. If unbind happens to be in progress, au0828 could clear enable_source and disable_source handlers leading to null pointer de-reference. Fix it by protecting enable_source and disable_source set and clear and protecting enable_source and disable_source handler access and the call itself. process 1 process 2 request video streaming unbind au0828 v4l2 checks if tuner is free ... ... au0828_unregister_media_device() ... ... (hold graph_mutex while clearing) mdev->enable_source = NULL; if (mdev) mdev->disable_source = NULL; (hold graph_mutex to check and call enable_source) if (mdev->enable_source) mdev->enable_source() If graph_mutex is held to just heck for handler being null and needs to be released before calling the handler, there will be another window for the handlers to be cleared. Hence, enable_source and disable_source handlers no longer hold the graph_mutex and expect callers to hold it to avoid forcing them release the graph_mutex before calling the handlers. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
757 lines
19 KiB
C
757 lines
19 KiB
C
/*
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* Driver for the Auvitek USB bridge
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*
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* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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*
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* GNU General Public License for more details.
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*/
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#include "au0828.h"
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#include "au8522.h"
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-common.h>
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#include <linux/mutex.h>
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/* Due to enum tuner_pad_index */
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#include <media/tuner.h>
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/*
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* 1 = General debug messages
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* 2 = USB handling
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* 4 = I2C related
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* 8 = Bridge related
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* 16 = IR related
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*/
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int au0828_debug;
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module_param_named(debug, au0828_debug, int, 0644);
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MODULE_PARM_DESC(debug,
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"set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
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static unsigned int disable_usb_speed_check;
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module_param(disable_usb_speed_check, int, 0444);
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MODULE_PARM_DESC(disable_usb_speed_check,
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"override min bandwidth requirement of 480M bps");
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#define _AU0828_BULKPIPE 0x03
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#define _BULKPIPESIZE 0xffff
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static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
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u16 index);
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static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
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u16 index, unsigned char *cp, u16 size);
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/* USB Direction */
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#define CMD_REQUEST_IN 0x00
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#define CMD_REQUEST_OUT 0x01
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u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
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{
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u8 result = 0;
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recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
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dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
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return result;
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}
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u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
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{
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dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
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return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
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}
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static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
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u16 index)
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{
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int status = -ENODEV;
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if (dev->usbdev) {
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/* cp must be memory that has been allocated by kmalloc */
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status = usb_control_msg(dev->usbdev,
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usb_sndctrlpipe(dev->usbdev, 0),
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request,
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USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE,
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value, index, NULL, 0, 1000);
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status = min(status, 0);
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if (status < 0) {
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pr_err("%s() Failed sending control message, error %d.\n",
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__func__, status);
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}
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}
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return status;
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}
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static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
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u16 index, unsigned char *cp, u16 size)
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{
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int status = -ENODEV;
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mutex_lock(&dev->mutex);
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if (dev->usbdev) {
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status = usb_control_msg(dev->usbdev,
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usb_rcvctrlpipe(dev->usbdev, 0),
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request,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value, index,
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dev->ctrlmsg, size, 1000);
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status = min(status, 0);
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if (status < 0) {
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pr_err("%s() Failed receiving control message, error %d.\n",
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__func__, status);
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}
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/* the host controller requires heap allocated memory, which
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is why we didn't just pass "cp" into usb_control_msg */
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memcpy(cp, dev->ctrlmsg, size);
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}
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mutex_unlock(&dev->mutex);
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return status;
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}
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#ifdef CONFIG_MEDIA_CONTROLLER
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static void au0828_media_graph_notify(struct media_entity *new,
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void *notify_data);
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#endif
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static void au0828_unregister_media_device(struct au0828_dev *dev)
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{
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#ifdef CONFIG_MEDIA_CONTROLLER
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struct media_device *mdev = dev->media_dev;
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struct media_entity_notify *notify, *nextp;
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if (!mdev || !media_devnode_is_registered(mdev->devnode))
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return;
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/* Remove au0828 entity_notify callbacks */
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list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
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if (notify->notify != au0828_media_graph_notify)
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continue;
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media_device_unregister_entity_notify(mdev, notify);
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}
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/* clear enable_source, disable_source */
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mutex_lock(&mdev->graph_mutex);
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dev->media_dev->source_priv = NULL;
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dev->media_dev->enable_source = NULL;
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dev->media_dev->disable_source = NULL;
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mutex_unlock(&mdev->graph_mutex);
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media_device_unregister(dev->media_dev);
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media_device_cleanup(dev->media_dev);
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kfree(dev->media_dev);
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dev->media_dev = NULL;
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#endif
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}
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void au0828_usb_release(struct au0828_dev *dev)
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{
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au0828_unregister_media_device(dev);
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/* I2C */
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au0828_i2c_unregister(dev);
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kfree(dev);
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}
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static void au0828_usb_disconnect(struct usb_interface *interface)
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{
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struct au0828_dev *dev = usb_get_intfdata(interface);
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dprintk(1, "%s()\n", __func__);
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/* there is a small window after disconnect, before
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dev->usbdev is NULL, for poll (e.g: IR) try to access
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the device and fill the dmesg with error messages.
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Set the status so poll routines can check and avoid
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access after disconnect.
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*/
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set_bit(DEV_DISCONNECTED, &dev->dev_state);
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au0828_rc_unregister(dev);
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/* Digital TV */
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au0828_dvb_unregister(dev);
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usb_set_intfdata(interface, NULL);
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mutex_lock(&dev->mutex);
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dev->usbdev = NULL;
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mutex_unlock(&dev->mutex);
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if (au0828_analog_unregister(dev)) {
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/*
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* No need to call au0828_usb_release() if V4L2 is enabled,
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* as this is already called via au0828_usb_v4l2_release()
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*/
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return;
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}
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au0828_usb_release(dev);
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}
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static int au0828_media_device_init(struct au0828_dev *dev,
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struct usb_device *udev)
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{
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#ifdef CONFIG_MEDIA_CONTROLLER
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struct media_device *mdev;
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mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
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if (!mdev)
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return -ENOMEM;
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/* check if media device is already initialized */
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if (!mdev->dev)
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media_device_usb_init(mdev, udev, udev->product);
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dev->media_dev = mdev;
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#endif
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return 0;
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}
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#ifdef CONFIG_MEDIA_CONTROLLER
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static void au0828_media_graph_notify(struct media_entity *new,
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void *notify_data)
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{
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struct au0828_dev *dev = (struct au0828_dev *) notify_data;
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int ret;
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struct media_entity *entity, *mixer = NULL, *decoder = NULL;
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if (!new) {
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/*
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* Called during au0828 probe time to connect
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* entites that were created prior to registering
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* the notify handler. Find mixer and decoder.
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*/
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media_device_for_each_entity(entity, dev->media_dev) {
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if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
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mixer = entity;
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else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
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decoder = entity;
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}
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goto create_link;
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}
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switch (new->function) {
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case MEDIA_ENT_F_AUDIO_MIXER:
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mixer = new;
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if (dev->decoder)
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decoder = dev->decoder;
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break;
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case MEDIA_ENT_F_ATV_DECODER:
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/* In case, Mixer is added first, find mixer and create link */
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media_device_for_each_entity(entity, dev->media_dev) {
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if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
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mixer = entity;
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}
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decoder = new;
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break;
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default:
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break;
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}
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create_link:
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if (decoder && mixer) {
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ret = media_create_pad_link(decoder,
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DEMOD_PAD_AUDIO_OUT,
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mixer, 0,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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dev_err(&dev->usbdev->dev,
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"Mixer Pad Link Create Error: %d\n", ret);
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}
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}
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/* Callers should hold graph_mutex */
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static int au0828_enable_source(struct media_entity *entity,
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struct media_pipeline *pipe)
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{
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struct media_entity *source, *find_source;
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struct media_entity *sink;
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struct media_link *link, *found_link = NULL;
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int ret = 0;
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struct media_device *mdev = entity->graph_obj.mdev;
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struct au0828_dev *dev;
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if (!mdev)
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return -ENODEV;
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dev = mdev->source_priv;
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/*
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* For Audio and V4L2 entity, find the link to which decoder
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* is the sink. Look for an active link between decoder and
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* source (tuner/s-video/Composite), if one exists, nothing
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* to do. If not, look for any active links between source
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* and any other entity. If one exists, source is busy. If
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* source is free, setup link and start pipeline from source.
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* For DVB FE entity, the source for the link is the tuner.
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* Check if tuner is available and setup link and start
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* pipeline.
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*/
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if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
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sink = entity;
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find_source = dev->tuner;
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} else {
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/* Analog isn't configured or register failed */
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if (!dev->decoder) {
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ret = -ENODEV;
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goto end;
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}
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sink = dev->decoder;
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/*
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* Default input is tuner and default input_type
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* is AU0828_VMUX_TELEVISION.
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* FIXME:
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* There is a problem when s_input is called to
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* change the default input. s_input will try to
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* enable_source before attempting to change the
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* input on the device, and will end up enabling
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* default source which is tuner.
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*
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* Additional logic is necessary in au0828
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* to detect that the input has changed and
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* enable the right source.
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*/
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if (dev->input_type == AU0828_VMUX_TELEVISION)
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find_source = dev->tuner;
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else if (dev->input_type == AU0828_VMUX_SVIDEO ||
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dev->input_type == AU0828_VMUX_COMPOSITE)
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find_source = &dev->input_ent[dev->input_type];
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else {
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/* unknown input - let user select input */
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ret = 0;
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goto end;
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}
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}
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/* Is an active link between sink and source */
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if (dev->active_link) {
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/*
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* If DVB is using the tuner and calling entity is
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* audio/video, the following check will be false,
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* since sink is different. Result is Busy.
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*/
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if (dev->active_link->sink->entity == sink &&
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dev->active_link->source->entity == find_source) {
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/*
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* Either ALSA or Video own tuner. sink is
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* the same for both. Prevent Video stepping
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* on ALSA when ALSA owns the source.
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*/
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if (dev->active_link_owner != entity &&
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dev->active_link_owner->function ==
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MEDIA_ENT_F_AUDIO_CAPTURE) {
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pr_debug("ALSA has the tuner\n");
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ret = -EBUSY;
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goto end;
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}
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ret = 0;
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goto end;
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} else {
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ret = -EBUSY;
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goto end;
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}
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}
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list_for_each_entry(link, &sink->links, list) {
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/* Check sink, and source */
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if (link->sink->entity == sink &&
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link->source->entity == find_source) {
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found_link = link;
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break;
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}
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}
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if (!found_link) {
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ret = -ENODEV;
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goto end;
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}
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/* activate link between source and sink and start pipeline */
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source = found_link->source->entity;
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ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
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if (ret) {
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pr_err("Activate tuner link %s->%s. Error %d\n",
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source->name, sink->name, ret);
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goto end;
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}
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ret = __media_pipeline_start(entity, pipe);
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if (ret) {
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pr_err("Start Pipeline: %s->%s Error %d\n",
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source->name, entity->name, ret);
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ret = __media_entity_setup_link(found_link, 0);
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pr_err("Deactivate link Error %d\n", ret);
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goto end;
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}
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/*
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* save active link and active link owner to avoid audio
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* deactivating video owned link from disable_source and
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* vice versa
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*/
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dev->active_link = found_link;
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dev->active_link_owner = entity;
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dev->active_source = source;
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dev->active_sink = sink;
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pr_debug("Enabled Source: %s->%s->%s Ret %d\n",
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dev->active_source->name, dev->active_sink->name,
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dev->active_link_owner->name, ret);
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end:
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pr_debug("au0828_enable_source() end %s %d %d\n",
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entity->name, entity->function, ret);
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return ret;
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}
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/* Callers should hold graph_mutex */
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static void au0828_disable_source(struct media_entity *entity)
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{
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int ret = 0;
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struct media_device *mdev = entity->graph_obj.mdev;
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struct au0828_dev *dev;
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if (!mdev)
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return;
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dev = mdev->source_priv;
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if (!dev->active_link)
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return;
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/* link is active - stop pipeline from source (tuner) */
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if (dev->active_link->sink->entity == dev->active_sink &&
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dev->active_link->source->entity == dev->active_source) {
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/*
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* prevent video from deactivating link when audio
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* has active pipeline
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*/
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if (dev->active_link_owner != entity)
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return;
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__media_pipeline_stop(entity);
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ret = __media_entity_setup_link(dev->active_link, 0);
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if (ret)
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pr_err("Deactivate link Error %d\n", ret);
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pr_debug("Disabled Source: %s->%s->%s Ret %d\n",
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dev->active_source->name, dev->active_sink->name,
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dev->active_link_owner->name, ret);
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dev->active_link = NULL;
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dev->active_link_owner = NULL;
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dev->active_source = NULL;
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dev->active_sink = NULL;
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}
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}
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#endif
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static int au0828_media_device_register(struct au0828_dev *dev,
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struct usb_device *udev)
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{
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#ifdef CONFIG_MEDIA_CONTROLLER
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int ret;
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struct media_entity *entity, *demod = NULL;
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struct media_link *link;
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if (!dev->media_dev)
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return 0;
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if (!media_devnode_is_registered(dev->media_dev->devnode)) {
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/* register media device */
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ret = media_device_register(dev->media_dev);
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if (ret) {
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dev_err(&udev->dev,
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"Media Device Register Error: %d\n", ret);
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return ret;
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}
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} else {
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/*
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* Call au0828_media_graph_notify() to connect
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* audio graph to our graph. In this case, audio
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* driver registered the device and there is no
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* entity_notify to be called when new entities
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* are added. Invoke it now.
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*/
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au0828_media_graph_notify(NULL, (void *) dev);
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}
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/*
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* Find tuner, decoder and demod.
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*
|
|
* The tuner and decoder should be cached, as they'll be used by
|
|
* au0828_enable_source.
|
|
*
|
|
* It also needs to disable the link between tuner and
|
|
* decoder/demod, to avoid disable step when tuner is requested
|
|
* by video or audio. Note that this step can't be done until dvb
|
|
* graph is created during dvb register.
|
|
*/
|
|
media_device_for_each_entity(entity, dev->media_dev) {
|
|
switch (entity->function) {
|
|
case MEDIA_ENT_F_TUNER:
|
|
dev->tuner = entity;
|
|
break;
|
|
case MEDIA_ENT_F_ATV_DECODER:
|
|
dev->decoder = entity;
|
|
break;
|
|
case MEDIA_ENT_F_DTV_DEMOD:
|
|
demod = entity;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Disable link between tuner->demod and/or tuner->decoder */
|
|
if (dev->tuner) {
|
|
list_for_each_entry(link, &dev->tuner->links, list) {
|
|
if (demod && link->sink->entity == demod)
|
|
media_entity_setup_link(link, 0);
|
|
if (dev->decoder && link->sink->entity == dev->decoder)
|
|
media_entity_setup_link(link, 0);
|
|
}
|
|
}
|
|
|
|
/* register entity_notify callback */
|
|
dev->entity_notify.notify_data = (void *) dev;
|
|
dev->entity_notify.notify = (void *) au0828_media_graph_notify;
|
|
ret = media_device_register_entity_notify(dev->media_dev,
|
|
&dev->entity_notify);
|
|
if (ret) {
|
|
dev_err(&udev->dev,
|
|
"Media Device register entity_notify Error: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
/* set enable_source */
|
|
mutex_lock(&dev->media_dev->graph_mutex);
|
|
dev->media_dev->source_priv = (void *) dev;
|
|
dev->media_dev->enable_source = au0828_enable_source;
|
|
dev->media_dev->disable_source = au0828_disable_source;
|
|
mutex_unlock(&dev->media_dev->graph_mutex);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int au0828_usb_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
int ifnum;
|
|
int retval = 0;
|
|
|
|
struct au0828_dev *dev;
|
|
struct usb_device *usbdev = interface_to_usbdev(interface);
|
|
|
|
ifnum = interface->altsetting->desc.bInterfaceNumber;
|
|
|
|
if (ifnum != 0)
|
|
return -ENODEV;
|
|
|
|
dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
|
|
le16_to_cpu(usbdev->descriptor.idVendor),
|
|
le16_to_cpu(usbdev->descriptor.idProduct),
|
|
ifnum);
|
|
|
|
/*
|
|
* Make sure we have 480 Mbps of bandwidth, otherwise things like
|
|
* video stream wouldn't likely work, since 12 Mbps is generally
|
|
* not enough even for most Digital TV streams.
|
|
*/
|
|
if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
|
|
pr_err("au0828: Device initialization failed.\n");
|
|
pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev == NULL) {
|
|
pr_err("%s() Unable to allocate memory\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mutex_init(&dev->lock);
|
|
mutex_lock(&dev->lock);
|
|
mutex_init(&dev->mutex);
|
|
mutex_init(&dev->dvb.lock);
|
|
dev->usbdev = usbdev;
|
|
dev->boardnr = id->driver_info;
|
|
dev->board = au0828_boards[dev->boardnr];
|
|
|
|
/* Initialize the media controller */
|
|
retval = au0828_media_device_init(dev, usbdev);
|
|
if (retval) {
|
|
pr_err("%s() au0828_media_device_init failed\n",
|
|
__func__);
|
|
mutex_unlock(&dev->lock);
|
|
kfree(dev);
|
|
return retval;
|
|
}
|
|
|
|
retval = au0828_v4l2_device_register(interface, dev);
|
|
if (retval) {
|
|
au0828_usb_v4l2_media_release(dev);
|
|
mutex_unlock(&dev->lock);
|
|
kfree(dev);
|
|
return retval;
|
|
}
|
|
|
|
/* Power Up the bridge */
|
|
au0828_write(dev, REG_600, 1 << 4);
|
|
|
|
/* Bring up the GPIO's and supporting devices */
|
|
au0828_gpio_setup(dev);
|
|
|
|
/* I2C */
|
|
au0828_i2c_register(dev);
|
|
|
|
/* Setup */
|
|
au0828_card_setup(dev);
|
|
|
|
/* Analog TV */
|
|
retval = au0828_analog_register(dev, interface);
|
|
if (retval) {
|
|
pr_err("%s() au0282_dev_register failed to register on V4L2\n",
|
|
__func__);
|
|
goto done;
|
|
}
|
|
|
|
/* Digital TV */
|
|
retval = au0828_dvb_register(dev);
|
|
if (retval)
|
|
pr_err("%s() au0282_dev_register failed\n",
|
|
__func__);
|
|
|
|
/* Remote controller */
|
|
au0828_rc_register(dev);
|
|
|
|
/*
|
|
* Store the pointer to the au0828_dev so it can be accessed in
|
|
* au0828_usb_disconnect
|
|
*/
|
|
usb_set_intfdata(interface, dev);
|
|
|
|
pr_info("Registered device AU0828 [%s]\n",
|
|
dev->board.name == NULL ? "Unset" : dev->board.name);
|
|
|
|
mutex_unlock(&dev->lock);
|
|
|
|
retval = au0828_media_device_register(dev, usbdev);
|
|
|
|
done:
|
|
if (retval < 0)
|
|
au0828_usb_disconnect(interface);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int au0828_suspend(struct usb_interface *interface,
|
|
pm_message_t message)
|
|
{
|
|
struct au0828_dev *dev = usb_get_intfdata(interface);
|
|
|
|
if (!dev)
|
|
return 0;
|
|
|
|
pr_info("Suspend\n");
|
|
|
|
au0828_rc_suspend(dev);
|
|
au0828_v4l2_suspend(dev);
|
|
au0828_dvb_suspend(dev);
|
|
|
|
/* FIXME: should suspend also ATV/DTV */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int au0828_resume(struct usb_interface *interface)
|
|
{
|
|
struct au0828_dev *dev = usb_get_intfdata(interface);
|
|
if (!dev)
|
|
return 0;
|
|
|
|
pr_info("Resume\n");
|
|
|
|
/* Power Up the bridge */
|
|
au0828_write(dev, REG_600, 1 << 4);
|
|
|
|
/* Bring up the GPIO's and supporting devices */
|
|
au0828_gpio_setup(dev);
|
|
|
|
au0828_rc_resume(dev);
|
|
au0828_v4l2_resume(dev);
|
|
au0828_dvb_resume(dev);
|
|
|
|
/* FIXME: should resume also ATV/DTV */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_driver au0828_usb_driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.probe = au0828_usb_probe,
|
|
.disconnect = au0828_usb_disconnect,
|
|
.id_table = au0828_usb_id_table,
|
|
.suspend = au0828_suspend,
|
|
.resume = au0828_resume,
|
|
.reset_resume = au0828_resume,
|
|
};
|
|
|
|
static int __init au0828_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (au0828_debug & 1)
|
|
pr_info("%s() Debugging is enabled\n", __func__);
|
|
|
|
if (au0828_debug & 2)
|
|
pr_info("%s() USB Debugging is enabled\n", __func__);
|
|
|
|
if (au0828_debug & 4)
|
|
pr_info("%s() I2C Debugging is enabled\n", __func__);
|
|
|
|
if (au0828_debug & 8)
|
|
pr_info("%s() Bridge Debugging is enabled\n",
|
|
__func__);
|
|
|
|
if (au0828_debug & 16)
|
|
pr_info("%s() IR Debugging is enabled\n",
|
|
__func__);
|
|
|
|
pr_info("au0828 driver loaded\n");
|
|
|
|
ret = usb_register(&au0828_usb_driver);
|
|
if (ret)
|
|
pr_err("usb_register failed, error = %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit au0828_exit(void)
|
|
{
|
|
usb_deregister(&au0828_usb_driver);
|
|
}
|
|
|
|
module_init(au0828_init);
|
|
module_exit(au0828_exit);
|
|
|
|
MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
|
|
MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION("0.0.3");
|