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V4L/DVB (4928): Usbvision_v4l2 robustness on disconnect

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This patch corrects 2 bugs (causes kernel oops) that occur when
unplugging the peripheral whereas nobody has opened it yet :
- do not call usbvision_stop_isoc if usbvision_init_isoc has not been called
- do not call wakeup_interruptible on waitqueues that did not have been
initialized with init_waitqueue_head

Signed-off-by: Thierry MERLE <thierry.merle@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Thierry 2006-12-04 08:31:17 -03:00 committed by Mauro Carvalho Chehab
parent f2242ee547
commit 5f7fb877be
2 changed files with 12 additions and 12 deletions
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17
drivers/media/video/usbvision/usbvision-core.c
View file

@ -2287,7 +2287,7 @@ static void usbvision_isocIrq(struct urb *urb, struct pt_regs *regs)
/* Manage streaming interruption */
if (usbvision->streaming == Stream_Interrupt) {
usbvision->streaming = Stream_Off;
usbvision->streaming = Stream_Idle;
if ((*f)) {
(*f)->grabstate = FrameState_Ready;
(*f)->scanstate = ScanState_Scanning;
@ -3092,7 +3092,7 @@ static int usbvision_stream_interrupt(struct usb_usbvision *usbvision)
usbvision->streaming = Stream_Interrupt;
ret = wait_event_timeout(usbvision->wait_stream,
(usbvision->streaming == Stream_Off),
(usbvision->streaming == Stream_Idle),
msecs_to_jiffies(USBVISION_NUMSBUF*USBVISION_URB_FRAMES));
return ret;
}
@ -3579,7 +3579,7 @@ static int usbvision_init_isoc(struct usb_usbvision *usbvision)
}
}
usbvision->streaming = Stream_On;
usbvision->streaming = Stream_Idle;
PDEBUG(DBG_ISOC, "%s: streaming=1 usbvision->video_endp=$%02x", __FUNCTION__, usbvision->video_endp);
return 0;
}
@ -3595,8 +3595,7 @@ static void usbvision_stop_isoc(struct usb_usbvision *usbvision)
{
int bufIdx, errCode, regValue;
// FIXME : removed the streaming==Stream_Off. This field has not the same signification than before !
if (usbvision->dev == NULL)
if ((usbvision->streaming == Stream_Off) || (usbvision->dev == NULL))
return;
/* Unschedule all of the iso td's */
@ -4292,7 +4291,7 @@ static int usbvision_v4l2_do_ioctl(struct inode *inode, struct file *file,
return -EINVAL;
if (list_empty(&(usbvision->outqueue))) {
if (usbvision->streaming == Stream_Off)
if (usbvision->streaming == Stream_Idle)
return -EINVAL;
ret = wait_event_interruptible
(usbvision->wait_frame,
@ -5665,6 +5664,7 @@ static int __devinit usbvision_probe(struct usb_interface *intf, const struct us
usbvision->isocPacketSize = 0;
usbvision->usb_bandwidth = 0;
usbvision->user = 0;
usbvision->streaming = Stream_Off;
usbvision_register_video(usbvision);
usbvision_configure_video(usbvision);
@ -5713,13 +5713,12 @@ static void __devexit usbvision_disconnect(struct usb_interface *intf)
usb_put_dev(usbvision->dev);
usbvision->dev = NULL; // USB device is no more
wake_up_interruptible(&usbvision->wait_frame);
wake_up_interruptible(&usbvision->wait_stream);
up(&usbvision->lock);
if (usbvision->user) {
info("%s: In use, disconnect pending", __FUNCTION__);
wake_up_interruptible(&usbvision->wait_frame);
wake_up_interruptible(&usbvision->wait_stream);
}
else {
usbvision_release(usbvision);

7
drivers/media/video/usbvision/usbvision.h
View file

@ -227,9 +227,10 @@ enum FrameState {
/* stream states */
enum StreamState {
Stream_Off,
Stream_Interrupt,
Stream_On,
Stream_Off, /* Driver streaming is completely OFF */
Stream_Idle, /* Driver streaming is ready to be put ON by the application */
Stream_Interrupt, /* Driver streaming must be interrupted */
Stream_On, /* Driver streaming is put ON by the application */
};
enum IsocState {