V4L/DVB (13907): cx18: Perform automatic rotation of very old, unread IDX buffers

According to the v4l2 spec, very old MPEG index entries needs to be discarded
in favor of newer index entries.  This change ensures the firmware always has
buffers for index entries at the expense of the oldest unread buffers.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/media/video/cx18/cx18-mailbox.c b/drivers/media/video/cx18/cx18-mailbox.c
index f231dd09c720..0ac0e2c993a5 100644
--- a/drivers/media/video/cx18/cx18-mailbox.c
+++ b/drivers/media/video/cx18/cx18-mailbox.c
@@ -223,8 +223,11 @@ static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
                 CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
                                   s->name, mdl->bytesused);
 
-                if (s->type != CX18_ENC_STREAM_TYPE_TS)
+                if (s->type != CX18_ENC_STREAM_TYPE_TS) {
                         cx18_enqueue(s, mdl, &s->q_full);
+                        if (s->type == CX18_ENC_STREAM_TYPE_IDX)
+                                cx18_stream_rotate_idx_mdls(cx);
+                }
                 else {
                         cx18_mdl_send_to_dvb(s, mdl);
                         cx18_enqueue(s, mdl, &s->q_free);