V4L/DVB (6050): ivtv: retry/timer improvements

- Give up frame after three retries.
- When the last capture/decode ends, make sure to delete the dma_timer.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-irq.c

@@ -494,7 +494,9 @@ static void ivtv_irq_dma_read(struct ivtv *itv)
 					s->sg_processed, s->sg_processing_size, itv->dma_retries);
 			write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
 			if (itv->dma_retries == 3) {
+				/* Too many retries, give up on this frame */
 				itv->dma_retries = 0;
+				s->sg_processed = s->sg_processing_size;
 			}
 			else {
 				/* Retry, starting with the first xfer segment.
@@ -554,7 +556,9 @@ static void ivtv_irq_enc_dma_complete(struct ivtv *itv)
 			s->dma_offset, s->sg_processed, s->sg_processing_size, itv->dma_retries);
 		write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
 		if (itv->dma_retries == 3) {
+			/* Too many retries, give up on this frame */
 			itv->dma_retries = 0;
+			s->sg_processed = s->sg_processing_size;
 		}
 		else {
 			/* Retry, starting with the first xfer segment.

drivers/media/video/ivtv/ivtv-streams.c

@@ -816,6 +816,7 @@ int ivtv_stop_v4l2_encode_stream(struct ivtv_stream *s, int gop_end)
 
 	/* Set the following Interrupt mask bits for capture */
 	ivtv_set_irq_mask(itv, IVTV_IRQ_MASK_CAPTURE);
+	del_timer(&itv->dma_timer);
 
 	/* event notification (off) */
 	if (test_and_clear_bit(IVTV_F_I_DIG_RST, &itv->i_flags)) {
@@ -873,6 +874,7 @@ int ivtv_stop_v4l2_decode_stream(struct ivtv_stream *s, int flags, u64 pts)
 	ivtv_vapi(itv, CX2341X_DEC_SET_EVENT_NOTIFICATION, 4, 0, 0, IVTV_IRQ_DEC_AUD_MODE_CHG, -1);
 
 	ivtv_set_irq_mask(itv, IVTV_IRQ_MASK_DECODE);
+	del_timer(&itv->dma_timer);
 
 	clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);