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>

diff --git a/drivers/media/video/stk-webcam.c b/drivers/media/video/stk-webcam.c
index 8aa56fe02546a796ac5bfbb946c2f81d0db26a2a..a8a72768ca91948dcf5a4550e51c50aee5813ab4 100644 (file)
--- 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;