libv4l: Don't report DQBUF errors when errno is EAGAIN

From: Hans de Goede <hdegoede@redhat.com>

Don't report DQBUF errors when errno is EAGAIN, this fixes flooding the
screen with errors when applications use non blocking mode

Priority: normal

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/v4l2-apps/libv4l/libv4l2/libv4l2.c b/v4l2-apps/libv4l/libv4l2/libv4l2.c
index d60ed6d39..314087255 100644
--- a/v4l2-apps/libv4l/libv4l2/libv4l2.c
+++ b/v4l2-apps/libv4l/libv4l2/libv4l2.c
@@ -264,9 +264,11 @@ static int v4l2_dequeue_and_convert(int index, struct v4l2_buffer *buf,
 
   do {
     if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_DQBUF, buf))) {
-      int saved_err = errno;
-      V4L2_LOG_ERR("dequeuing buf: %s\n", strerror(errno));
-      errno = saved_err;
+      if (errno != EAGAIN) {
+	int saved_err = errno;
+	V4L2_LOG_ERR("dequeuing buf: %s\n", strerror(errno));
+	errno = saved_err;
+      }
       return result;
     }