[PATCH] pwc: do not block in VIDIOC_DQBUF

From: "audetto@tiscali.it" <audetto@tiscali.it>
To: video4linux-list@redhat.com
Subject: [PATCH] pwc: do not block in VIDIOC_DQBUF
Date: Sat, 5 Jul 2008 15:23:42 +0200 (CEST)	[thread overview]
Message-ID: <25500277.1215264222465.JavaMail.root@ps10> (raw)

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I think the ioctl VIDIOC_DQBUF in pwc does not follow the API spec.
It should not block if there are no buffers and the device has been 
opened with O_NONBLOCK.

I am not sure the patch is 100% correct, since I do not understand it 
completely.

Andrea



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diff -r 87aa6048e718 linux/drivers/media/video/pwc/pwc-v4l.c

--- a/linux/drivers/media/video/pwc/pwc-v4l.c	Wed Jul 02 08:59:38 2008 -0300
+++ b/linux/drivers/media/video/pwc/pwc-v4l.c	Sat Jul 05 14:14:03 2008 +0100
@@ -1134,6 +1134,13 @@
 				     frameq is safe now.
 			 */
 			add_wait_queue(&pdev->frameq, &wait);
+
+			if ((pdev->full_frames == NULL) && (file->f_flags & O_NONBLOCK)) {
+				remove_wait_queue(&pdev->frameq, &wait);
+				set_current_state(TASK_RUNNING);
+				return -EAGAIN;
+			}
+
 			while (pdev->full_frames == NULL) {
 				if (pdev->error_status) {
 					remove_wait_queue(&pdev->frameq, &wait);

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