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| author | Oliver Neukum <oliver@neukum.org> | 2013-01-10 07:04:55 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-02-05 14:32:21 -0200 |
| commit | a82a45f65377b05fe8cd3167c7b0a70c508356b8 (patch) | |
| tree | 6b40a93218a8abef192e346c4052875f07c58a07 /drivers/media/usb/uvc | |
| parent | 8c0d44e250735b09e255ce0483c47eb2f68d3fa7 (diff) | |
| download | blackbird-op-linux-a82a45f65377b05fe8cd3167c7b0a70c508356b8.tar.gz blackbird-op-linux-a82a45f65377b05fe8cd3167c7b0a70c508356b8.zip | |
[media] uvcvideo: Fix race of open and suspend in error case
Ming Lei reported:
IMO, there is a minor fault in the error handling path of
uvc_status_start() inside uvc_v4l2_open(), and the 'users' count should
have been decreased before usb_autopm_put_interface(). In theory, a [URB
resubmission] warning can be triggered when the device is opened just
between usb_autopm_put_interface() and atomic_dec(&stream->dev->users).
The fix is trivial.
Reported-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/usb/uvc')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_v4l2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 97a4ffde5d6f..b2dc32623a71 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -501,8 +501,8 @@ static int uvc_v4l2_open(struct file *file) if (atomic_inc_return(&stream->dev->users) == 1) { ret = uvc_status_start(stream->dev); if (ret < 0) { - usb_autopm_put_interface(stream->dev->intf); atomic_dec(&stream->dev->users); + usb_autopm_put_interface(stream->dev->intf); kfree(handle); return ret; } |
