From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Sun, 10 Feb 2013 17:37:58 +0000 (-0300)
Subject: [media] stk-webcam: implement support for count == 0 when calling REQBUFS
X-Git-Tag: v3.10-rc1~136^2~561
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9776e17189d33b0ac9235597460d6a22cf1bc6a7;p=platform%2Fkernel%2Flinux-3.10.git

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

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>
---

diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index 45d73e2..c43c8d3 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -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 */