mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 18:53:52 +08:00
d1e164289e
Make the V4L2 async framework a bit more robust by allowing to clean up an uninitialised notifier. Otherwise the result would be a (close to) NULL pointer dereference. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
773 lines
18 KiB
C
773 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* V4L2 asynchronous subdevice registration API
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*
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* Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/list.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <media/v4l2-async.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-subdev.h>
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static int v4l2_async_notifier_call_bound(struct v4l2_async_notifier *n,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *asd)
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{
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if (!n->ops || !n->ops->bound)
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return 0;
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return n->ops->bound(n, subdev, asd);
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}
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static void v4l2_async_notifier_call_unbind(struct v4l2_async_notifier *n,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *asd)
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{
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if (!n->ops || !n->ops->unbind)
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return;
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n->ops->unbind(n, subdev, asd);
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}
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static int v4l2_async_notifier_call_complete(struct v4l2_async_notifier *n)
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{
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if (!n->ops || !n->ops->complete)
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return 0;
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return n->ops->complete(n);
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}
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static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
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{
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#if IS_ENABLED(CONFIG_I2C)
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struct i2c_client *client = i2c_verify_client(sd->dev);
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return client &&
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asd->match.i2c.adapter_id == client->adapter->nr &&
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asd->match.i2c.address == client->addr;
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#else
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return false;
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#endif
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}
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static bool match_devname(struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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return !strcmp(asd->match.device_name, dev_name(sd->dev));
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}
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static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
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{
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return sd->fwnode == asd->match.fwnode;
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}
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static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
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{
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if (!asd->match.custom.match)
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/* Match always */
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return true;
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return asd->match.custom.match(sd->dev, asd);
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}
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static LIST_HEAD(subdev_list);
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static LIST_HEAD(notifier_list);
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static DEFINE_MUTEX(list_lock);
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static struct v4l2_async_subdev *
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v4l2_async_find_match(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *sd)
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{
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bool (*match)(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd);
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struct v4l2_async_subdev *asd;
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list_for_each_entry(asd, ¬ifier->waiting, list) {
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/* bus_type has been verified valid before */
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switch (asd->match_type) {
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case V4L2_ASYNC_MATCH_CUSTOM:
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match = match_custom;
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break;
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case V4L2_ASYNC_MATCH_DEVNAME:
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match = match_devname;
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break;
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case V4L2_ASYNC_MATCH_I2C:
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match = match_i2c;
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break;
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case V4L2_ASYNC_MATCH_FWNODE:
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match = match_fwnode;
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break;
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default:
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/* Cannot happen, unless someone breaks us */
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WARN_ON(true);
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return NULL;
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}
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/* match cannot be NULL here */
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if (match(sd, asd))
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return asd;
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}
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return NULL;
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}
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/* Compare two async sub-device descriptors for equivalence */
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static bool asd_equal(struct v4l2_async_subdev *asd_x,
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struct v4l2_async_subdev *asd_y)
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{
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if (asd_x->match_type != asd_y->match_type)
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return false;
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switch (asd_x->match_type) {
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case V4L2_ASYNC_MATCH_DEVNAME:
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return strcmp(asd_x->match.device_name,
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asd_y->match.device_name) == 0;
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case V4L2_ASYNC_MATCH_I2C:
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return asd_x->match.i2c.adapter_id ==
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asd_y->match.i2c.adapter_id &&
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asd_x->match.i2c.address ==
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asd_y->match.i2c.address;
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case V4L2_ASYNC_MATCH_FWNODE:
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return asd_x->match.fwnode == asd_y->match.fwnode;
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default:
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break;
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}
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return false;
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}
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/* Find the sub-device notifier registered by a sub-device driver. */
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static struct v4l2_async_notifier *
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v4l2_async_find_subdev_notifier(struct v4l2_subdev *sd)
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{
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struct v4l2_async_notifier *n;
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list_for_each_entry(n, ¬ifier_list, list)
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if (n->sd == sd)
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return n;
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return NULL;
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}
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/* Get v4l2_device related to the notifier if one can be found. */
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static struct v4l2_device *
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v4l2_async_notifier_find_v4l2_dev(struct v4l2_async_notifier *notifier)
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{
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while (notifier->parent)
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notifier = notifier->parent;
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return notifier->v4l2_dev;
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}
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/*
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* Return true if all child sub-device notifiers are complete, false otherwise.
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*/
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static bool
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v4l2_async_notifier_can_complete(struct v4l2_async_notifier *notifier)
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{
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struct v4l2_subdev *sd;
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if (!list_empty(¬ifier->waiting))
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return false;
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list_for_each_entry(sd, ¬ifier->done, async_list) {
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struct v4l2_async_notifier *subdev_notifier =
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v4l2_async_find_subdev_notifier(sd);
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if (subdev_notifier &&
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!v4l2_async_notifier_can_complete(subdev_notifier))
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return false;
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}
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return true;
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}
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/*
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* Complete the master notifier if possible. This is done when all async
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* sub-devices have been bound; v4l2_device is also available then.
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*/
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static int
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v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier)
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{
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/* Quick check whether there are still more sub-devices here. */
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if (!list_empty(¬ifier->waiting))
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return 0;
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/* Check the entire notifier tree; find the root notifier first. */
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while (notifier->parent)
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notifier = notifier->parent;
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/* This is root if it has v4l2_dev. */
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if (!notifier->v4l2_dev)
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return 0;
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/* Is everything ready? */
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if (!v4l2_async_notifier_can_complete(notifier))
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return 0;
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return v4l2_async_notifier_call_complete(notifier);
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}
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static int
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v4l2_async_notifier_try_all_subdevs(struct v4l2_async_notifier *notifier);
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static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
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struct v4l2_device *v4l2_dev,
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struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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struct v4l2_async_notifier *subdev_notifier;
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int ret;
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ret = v4l2_device_register_subdev(v4l2_dev, sd);
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if (ret < 0)
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return ret;
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ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
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if (ret < 0) {
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v4l2_device_unregister_subdev(sd);
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return ret;
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}
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/* Remove from the waiting list */
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list_del(&asd->list);
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sd->asd = asd;
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sd->notifier = notifier;
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/* Move from the global subdevice list to notifier's done */
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list_move(&sd->async_list, ¬ifier->done);
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/*
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* See if the sub-device has a notifier. If not, return here.
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*/
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subdev_notifier = v4l2_async_find_subdev_notifier(sd);
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if (!subdev_notifier || subdev_notifier->parent)
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return 0;
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/*
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* Proceed with checking for the sub-device notifier's async
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* sub-devices, and return the result. The error will be handled by the
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* caller.
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*/
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subdev_notifier->parent = notifier;
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return v4l2_async_notifier_try_all_subdevs(subdev_notifier);
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}
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/* Test all async sub-devices in a notifier for a match. */
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static int
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v4l2_async_notifier_try_all_subdevs(struct v4l2_async_notifier *notifier)
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{
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struct v4l2_device *v4l2_dev =
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v4l2_async_notifier_find_v4l2_dev(notifier);
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struct v4l2_subdev *sd;
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if (!v4l2_dev)
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return 0;
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again:
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list_for_each_entry(sd, &subdev_list, async_list) {
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struct v4l2_async_subdev *asd;
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int ret;
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asd = v4l2_async_find_match(notifier, sd);
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if (!asd)
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continue;
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ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
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if (ret < 0)
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return ret;
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/*
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* v4l2_async_match_notify() may lead to registering a
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* new notifier and thus changing the async subdevs
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* list. In order to proceed safely from here, restart
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* parsing the list from the beginning.
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*/
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goto again;
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}
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return 0;
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}
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static void v4l2_async_cleanup(struct v4l2_subdev *sd)
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{
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v4l2_device_unregister_subdev(sd);
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/*
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* Subdevice driver will reprobe and put the subdev back
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* onto the list
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*/
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list_del_init(&sd->async_list);
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sd->asd = NULL;
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}
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/* Unbind all sub-devices in the notifier tree. */
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static void
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v4l2_async_notifier_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
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{
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struct v4l2_subdev *sd, *tmp;
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list_for_each_entry_safe(sd, tmp, ¬ifier->done, async_list) {
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struct v4l2_async_notifier *subdev_notifier =
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v4l2_async_find_subdev_notifier(sd);
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if (subdev_notifier)
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v4l2_async_notifier_unbind_all_subdevs(subdev_notifier);
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v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
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v4l2_async_cleanup(sd);
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list_move(&sd->async_list, &subdev_list);
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}
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notifier->parent = NULL;
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}
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/* See if an async sub-device can be found in a notifier's lists. */
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static bool
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__v4l2_async_notifier_has_async_subdev(struct v4l2_async_notifier *notifier,
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struct v4l2_async_subdev *asd)
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{
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struct v4l2_async_subdev *asd_y;
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struct v4l2_subdev *sd;
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list_for_each_entry(asd_y, ¬ifier->waiting, list)
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if (asd_equal(asd, asd_y))
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return true;
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list_for_each_entry(sd, ¬ifier->done, async_list) {
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if (WARN_ON(!sd->asd))
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continue;
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if (asd_equal(asd, sd->asd))
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return true;
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}
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return false;
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}
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/*
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* Find out whether an async sub-device was set up already or
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* whether it exists in a given notifier before @this_index.
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* If @this_index < 0, search the notifier's entire @asd_list.
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*/
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static bool
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v4l2_async_notifier_has_async_subdev(struct v4l2_async_notifier *notifier,
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struct v4l2_async_subdev *asd,
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int this_index)
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{
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struct v4l2_async_subdev *asd_y;
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int j = 0;
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lockdep_assert_held(&list_lock);
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/* Check that an asd is not being added more than once. */
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list_for_each_entry(asd_y, ¬ifier->asd_list, asd_list) {
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if (this_index >= 0 && j++ >= this_index)
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break;
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if (asd_equal(asd, asd_y))
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return true;
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}
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/* Check that an asd does not exist in other notifiers. */
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list_for_each_entry(notifier, ¬ifier_list, list)
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if (__v4l2_async_notifier_has_async_subdev(notifier, asd))
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return true;
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return false;
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}
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static int v4l2_async_notifier_asd_valid(struct v4l2_async_notifier *notifier,
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struct v4l2_async_subdev *asd,
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int this_index)
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{
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struct device *dev =
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notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL;
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if (!asd)
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return -EINVAL;
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switch (asd->match_type) {
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case V4L2_ASYNC_MATCH_CUSTOM:
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case V4L2_ASYNC_MATCH_DEVNAME:
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case V4L2_ASYNC_MATCH_I2C:
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case V4L2_ASYNC_MATCH_FWNODE:
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if (v4l2_async_notifier_has_async_subdev(notifier, asd,
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this_index)) {
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dev_dbg(dev, "subdev descriptor already listed in this or other notifiers\n");
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return -EEXIST;
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}
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break;
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default:
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dev_err(dev, "Invalid match type %u on %p\n",
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asd->match_type, asd);
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return -EINVAL;
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}
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return 0;
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}
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void v4l2_async_notifier_init(struct v4l2_async_notifier *notifier)
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{
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INIT_LIST_HEAD(¬ifier->asd_list);
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}
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EXPORT_SYMBOL(v4l2_async_notifier_init);
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static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
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{
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struct v4l2_async_subdev *asd;
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int ret, i = 0;
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INIT_LIST_HEAD(¬ifier->waiting);
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INIT_LIST_HEAD(¬ifier->done);
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mutex_lock(&list_lock);
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list_for_each_entry(asd, ¬ifier->asd_list, asd_list) {
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ret = v4l2_async_notifier_asd_valid(notifier, asd, i++);
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if (ret)
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goto err_unlock;
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list_add_tail(&asd->list, ¬ifier->waiting);
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}
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ret = v4l2_async_notifier_try_all_subdevs(notifier);
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if (ret < 0)
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goto err_unbind;
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ret = v4l2_async_notifier_try_complete(notifier);
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if (ret < 0)
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goto err_unbind;
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/* Keep also completed notifiers on the list */
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list_add(¬ifier->list, ¬ifier_list);
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mutex_unlock(&list_lock);
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return 0;
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err_unbind:
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/*
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* On failure, unbind all sub-devices registered through this notifier.
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*/
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v4l2_async_notifier_unbind_all_subdevs(notifier);
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err_unlock:
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mutex_unlock(&list_lock);
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return ret;
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}
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int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
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struct v4l2_async_notifier *notifier)
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{
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int ret;
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if (WARN_ON(!v4l2_dev || notifier->sd))
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return -EINVAL;
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notifier->v4l2_dev = v4l2_dev;
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ret = __v4l2_async_notifier_register(notifier);
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if (ret)
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notifier->v4l2_dev = NULL;
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return ret;
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}
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EXPORT_SYMBOL(v4l2_async_notifier_register);
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int v4l2_async_subdev_notifier_register(struct v4l2_subdev *sd,
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struct v4l2_async_notifier *notifier)
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{
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int ret;
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if (WARN_ON(!sd || notifier->v4l2_dev))
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return -EINVAL;
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notifier->sd = sd;
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|
|
ret = __v4l2_async_notifier_register(notifier);
|
|
if (ret)
|
|
notifier->sd = NULL;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_subdev_notifier_register);
|
|
|
|
static void
|
|
__v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
|
|
{
|
|
if (!notifier || (!notifier->v4l2_dev && !notifier->sd))
|
|
return;
|
|
|
|
v4l2_async_notifier_unbind_all_subdevs(notifier);
|
|
|
|
notifier->sd = NULL;
|
|
notifier->v4l2_dev = NULL;
|
|
|
|
list_del(¬ifier->list);
|
|
}
|
|
|
|
void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
|
|
{
|
|
mutex_lock(&list_lock);
|
|
|
|
__v4l2_async_notifier_unregister(notifier);
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_notifier_unregister);
|
|
|
|
static void __v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier)
|
|
{
|
|
struct v4l2_async_subdev *asd, *tmp;
|
|
|
|
if (!notifier || !notifier->asd_list.next)
|
|
return;
|
|
|
|
list_for_each_entry_safe(asd, tmp, ¬ifier->asd_list, asd_list) {
|
|
switch (asd->match_type) {
|
|
case V4L2_ASYNC_MATCH_FWNODE:
|
|
fwnode_handle_put(asd->match.fwnode);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
list_del(&asd->asd_list);
|
|
kfree(asd);
|
|
}
|
|
}
|
|
|
|
void v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier)
|
|
{
|
|
mutex_lock(&list_lock);
|
|
|
|
__v4l2_async_notifier_cleanup(notifier);
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_cleanup);
|
|
|
|
int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
ret = v4l2_async_notifier_asd_valid(notifier, asd, -1);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
list_add_tail(&asd->asd_list, ¬ifier->asd_list);
|
|
|
|
unlock:
|
|
mutex_unlock(&list_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_subdev);
|
|
|
|
struct v4l2_async_subdev *
|
|
v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
|
|
struct fwnode_handle *fwnode,
|
|
unsigned int asd_struct_size)
|
|
{
|
|
struct v4l2_async_subdev *asd;
|
|
int ret;
|
|
|
|
asd = kzalloc(asd_struct_size, GFP_KERNEL);
|
|
if (!asd)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
|
|
asd->match.fwnode = fwnode_handle_get(fwnode);
|
|
|
|
ret = v4l2_async_notifier_add_subdev(notifier, asd);
|
|
if (ret) {
|
|
fwnode_handle_put(fwnode);
|
|
kfree(asd);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return asd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_fwnode_subdev);
|
|
|
|
int
|
|
v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
|
|
struct fwnode_handle *endpoint,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
struct fwnode_handle *remote;
|
|
int ret;
|
|
|
|
remote = fwnode_graph_get_remote_port_parent(endpoint);
|
|
if (!remote)
|
|
return -ENOTCONN;
|
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
|
|
asd->match.fwnode = remote;
|
|
|
|
ret = v4l2_async_notifier_add_subdev(notif, asd);
|
|
if (ret)
|
|
fwnode_handle_put(remote);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_fwnode_remote_subdev);
|
|
|
|
struct v4l2_async_subdev *
|
|
v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
|
|
int adapter_id, unsigned short address,
|
|
unsigned int asd_struct_size)
|
|
{
|
|
struct v4l2_async_subdev *asd;
|
|
int ret;
|
|
|
|
asd = kzalloc(asd_struct_size, GFP_KERNEL);
|
|
if (!asd)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_I2C;
|
|
asd->match.i2c.adapter_id = adapter_id;
|
|
asd->match.i2c.address = address;
|
|
|
|
ret = v4l2_async_notifier_add_subdev(notifier, asd);
|
|
if (ret) {
|
|
kfree(asd);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return asd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_i2c_subdev);
|
|
|
|
struct v4l2_async_subdev *
|
|
v4l2_async_notifier_add_devname_subdev(struct v4l2_async_notifier *notifier,
|
|
const char *device_name,
|
|
unsigned int asd_struct_size)
|
|
{
|
|
struct v4l2_async_subdev *asd;
|
|
int ret;
|
|
|
|
asd = kzalloc(asd_struct_size, GFP_KERNEL);
|
|
if (!asd)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_DEVNAME;
|
|
asd->match.device_name = device_name;
|
|
|
|
ret = v4l2_async_notifier_add_subdev(notifier, asd);
|
|
if (ret) {
|
|
kfree(asd);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return asd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_devname_subdev);
|
|
|
|
int v4l2_async_register_subdev(struct v4l2_subdev *sd)
|
|
{
|
|
struct v4l2_async_notifier *subdev_notifier;
|
|
struct v4l2_async_notifier *notifier;
|
|
int ret;
|
|
|
|
/*
|
|
* No reference taken. The reference is held by the device
|
|
* (struct v4l2_subdev.dev), and async sub-device does not
|
|
* exist independently of the device at any point of time.
|
|
*/
|
|
if (!sd->fwnode && sd->dev)
|
|
sd->fwnode = dev_fwnode(sd->dev);
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
INIT_LIST_HEAD(&sd->async_list);
|
|
|
|
list_for_each_entry(notifier, ¬ifier_list, list) {
|
|
struct v4l2_device *v4l2_dev =
|
|
v4l2_async_notifier_find_v4l2_dev(notifier);
|
|
struct v4l2_async_subdev *asd;
|
|
|
|
if (!v4l2_dev)
|
|
continue;
|
|
|
|
asd = v4l2_async_find_match(notifier, sd);
|
|
if (!asd)
|
|
continue;
|
|
|
|
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
|
|
if (ret)
|
|
goto err_unbind;
|
|
|
|
ret = v4l2_async_notifier_try_complete(notifier);
|
|
if (ret)
|
|
goto err_unbind;
|
|
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* None matched, wait for hot-plugging */
|
|
list_add(&sd->async_list, &subdev_list);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&list_lock);
|
|
|
|
return 0;
|
|
|
|
err_unbind:
|
|
/*
|
|
* Complete failed. Unbind the sub-devices bound through registering
|
|
* this async sub-device.
|
|
*/
|
|
subdev_notifier = v4l2_async_find_subdev_notifier(sd);
|
|
if (subdev_notifier)
|
|
v4l2_async_notifier_unbind_all_subdevs(subdev_notifier);
|
|
|
|
if (sd->asd)
|
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
|
|
v4l2_async_cleanup(sd);
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_register_subdev);
|
|
|
|
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
|
|
{
|
|
mutex_lock(&list_lock);
|
|
|
|
__v4l2_async_notifier_unregister(sd->subdev_notifier);
|
|
__v4l2_async_notifier_cleanup(sd->subdev_notifier);
|
|
kfree(sd->subdev_notifier);
|
|
sd->subdev_notifier = NULL;
|
|
|
|
if (sd->asd) {
|
|
struct v4l2_async_notifier *notifier = sd->notifier;
|
|
|
|
list_add(&sd->asd->list, ¬ifier->waiting);
|
|
|
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
|
|
}
|
|
|
|
v4l2_async_cleanup(sd);
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_unregister_subdev);
|