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[media] vp702x: preallocate memory on device probe

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This sets up a buffer and a mutex protecting that buffer in
the struct vp702x_device_state.

The definition of struct vp702x_device_state is moved into the header
in order to use the buffer also in the frontend.

Signed-off-by: Florian Mickler <florian@mickler.org>
Cc: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Florian Mickler 2011-03-21 07:19:08 -03:00 committed by Mauro Carvalho Chehab
parent 36f773e8e3
commit 1c6410f317
2 changed files with 42 additions and 7 deletions
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41
drivers/media/dvb/dvb-usb/vp702x.c
View File

@ -15,6 +15,7 @@
* see Documentation/dvb/README.dvb-usb for more information
*/
#include "vp702x.h"
#include <linux/mutex.h>
/* debug */
int dvb_usb_vp702x_debug;
@ -29,10 +30,6 @@ struct vp702x_adapter_state {
u8 pid_filter_state;
};
struct vp702x_device_state {
u8 power_state;
};
/* check for mutex FIXME */
int vp702x_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8 *b, int blen)
{
@ -241,8 +238,38 @@ static struct dvb_usb_device_properties vp702x_properties;
static int vp702x_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return dvb_usb_device_init(intf, &vp702x_properties,
THIS_MODULE, NULL, adapter_nr);
struct dvb_usb_device *d;
struct vp702x_device_state *st;
int ret;
ret = dvb_usb_device_init(intf, &vp702x_properties,
THIS_MODULE, &d, adapter_nr);
if (ret)
goto out;
st = d->priv;
st->buf_len = 16;
st->buf = kmalloc(st->buf_len, GFP_KERNEL);
if (!st->buf) {
ret = -ENOMEM;
dvb_usb_device_exit(intf);
goto out;
}
mutex_init(&st->buf_mutex);
out:
return ret;
}
static void vp702x_usb_disconnect(struct usb_interface *intf)
{
struct dvb_usb_device *d = usb_get_intfdata(intf);
struct vp702x_device_state *st = d->priv;
mutex_lock(&st->buf_mutex);
kfree(st->buf);
mutex_unlock(&st->buf_mutex);
dvb_usb_device_exit(intf);
}
static struct usb_device_id vp702x_usb_table [] = {
@ -309,7 +336,7 @@ static struct dvb_usb_device_properties vp702x_properties = {
static struct usb_driver vp702x_usb_driver = {
.name = "dvb_usb_vp702x",
.probe = vp702x_usb_probe,
.disconnect = dvb_usb_device_exit,
.disconnect = vp702x_usb_disconnect,
.id_table = vp702x_usb_table,
};

8
drivers/media/dvb/dvb-usb/vp702x.h
View File

@ -98,6 +98,14 @@ extern int dvb_usb_vp702x_debug;
#define RESET_TUNER 0xBE
/* IN i: 0, v: 0, no extra buffer */
struct vp702x_device_state {
u8 power_state;
struct mutex buf_mutex;
int buf_len;
u8 *buf;
};
extern struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d);
extern int vp702x_usb_inout_op(struct dvb_usb_device *d, u8 *o, int olen, u8 *i, int ilen, int msec);