V4L/DVB (8491): stkwebcam: Always reuse last queued buffer

This change keeps the video stream going on when the application
is slow queuing buffers, instead of spamming dmesg and hanging.

Fixes a problem with aMSN reported by Samed Beyribey <beyribey@gmail.com>

Signed-off-by: Jaime Velasco Juan <jsagarribay@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 12 insertions, 11 deletions

diff --git a/drivers/media/video/stk-webcam.c b/drivers/media/video/stk-webcam.c
index 8aa56fe02546..a8a72768ca91 100644
--- a/drivers/media/video/stk-webcam.c
+++ b/drivers/media/video/stk-webcam.c
@@ -445,18 +445,19 @@ static void stk_isoc_handler(struct urb *urb)
                                 fb->v4lbuf.bytesused = 0;
                                 fill = fb->buffer;
                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
-                                list_move_tail(dev->sio_avail.next,
-                                        &dev->sio_full);
-                                wake_up(&dev->wait_frame);
-                                if (list_empty(&dev->sio_avail)) {
-                                        (void) (printk_ratelimit() &&
-                                        STK_ERROR("No buffer available\n"));
-                                        goto resubmit;
+                                if (list_is_singular(&dev->sio_avail)) {
+                                        /* Always reuse the last buffer */
+                                        fb->v4lbuf.bytesused = 0;
+                                        fill = fb->buffer;
+                                } else {
+                                        list_move_tail(dev->sio_avail.next,
+                                                &dev->sio_full);
+                                        wake_up(&dev->wait_frame);
+                                        fb = list_first_entry(&dev->sio_avail,
+                                                struct stk_sio_buffer, list);
+                                        fb->v4lbuf.bytesused = 0;
+                                        fill = fb->buffer;
                                 }
-                                fb = list_first_entry(&dev->sio_avail,
-                                        struct stk_sio_buffer, list);
-                                fb->v4lbuf.bytesused = 0;
-                                fill = fb->buffer;
                         }
                 } else {
                         framelen -= 4;