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[media] stk-webcam: implement support for count == 0 when calling REQBUFS

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The spec specifies that setting count to 0 in v4l2_requestbuffers
should result in releasing any streaming resources and the stream
ownership. Implement this.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Arvydas Sidorenko <asido4@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2013-02-10 14:37:58 -03:00 committed by Mauro Carvalho Chehab
parent f81e372a5d
commit 9776e17189
1 changed files with 7 additions and 0 deletions
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7
drivers/media/usb/stkwebcam/stk-webcam.c
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@ -1046,6 +1046,13 @@ static int stk_vidioc_reqbufs(struct file *filp,
if (is_streaming(dev)
|| (dev->owner && dev->owner != filp))
return -EBUSY;
stk_free_buffers(dev);
if (rb->count == 0) {
stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
unset_initialised(dev);
dev->owner = NULL;
return 0;
}
dev->owner = filp;
/*FIXME If they ask for zero, we must stop streaming and free */