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[media] gspca: Call sd_stop0 on disconnect 

This is necessary to ensure that worker-threads accessing the device
are stopped before our disconnect handler returns.

This causes a problem with stream_off calling sd_stop0 a second time
when the device handle is closed. This is fixed by setting
gscpa_dev->streaming to 0 on disconnect.

Note that now stream_off will never be called on a disconnected device,
and the present check can thus be removed from stream_off.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede 2012-05-07 06:25:30 -03:00 committed by Mauro Carvalho Chehab
parent a2d887c5fe
commit eb238732a5
1 changed files with 11 additions and 11 deletions
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22
drivers/media/video/gspca/gspca.c
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@ -595,16 +595,12 @@ static int gspca_set_alt0(struct gspca_dev *gspca_dev)
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
gspca_dev->streaming = 0;
if (gspca_dev->present) {
if (gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_input_destroy_urb(gspca_dev);
gspca_set_alt0(gspca_dev);
gspca_input_create_urb(gspca_dev);
}
/* always call stop0 to free the subdriver's resources */
if (gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_input_destroy_urb(gspca_dev);
gspca_set_alt0(gspca_dev);
gspca_input_create_urb(gspca_dev);
if (gspca_dev->sd_desc->stop0)
gspca_dev->sd_desc->stop0(gspca_dev);
PDEBUG(D_STREAM, "stream off OK");
@ -2369,7 +2365,6 @@ void gspca_disconnect(struct usb_interface *intf)
usb_set_intfdata(intf, NULL);
gspca_dev->dev = NULL;
gspca_dev->present = 0;
wake_up_interruptible(&gspca_dev->wq);
destroy_urbs(gspca_dev);
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
@ -2380,6 +2375,11 @@ void gspca_disconnect(struct usb_interface *intf)
input_unregister_device(input_dev);
}
#endif
/* Free subdriver's streaming resources / stop sd workqueue(s) */
if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
gspca_dev->sd_desc->stop0(gspca_dev);
gspca_dev->streaming = 0;
wake_up_interruptible(&gspca_dev->wq);
v4l2_device_disconnect(&gspca_dev->v4l2_dev);
video_unregister_device(&gspca_dev->vdev);