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
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);
_______________________________________________
pwc mailing list
[email protected]
http://lists.saillard.org/mailman/listinfo/pwc
