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path: root/drivers/media/video/ivtv/ivtv-yuv.c
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Diffstat (limited to 'drivers/media/video/ivtv/ivtv-yuv.c')
-rw-r--r--drivers/media/video/ivtv/ivtv-yuv.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/media/video/ivtv/ivtv-yuv.c b/drivers/media/video/ivtv/ivtv-yuv.c
index dcbab6ad4c2..2ad65eb2983 100644
--- a/drivers/media/video/ivtv/ivtv-yuv.c
+++ b/drivers/media/video/ivtv/ivtv-yuv.c
@@ -1149,23 +1149,37 @@ int ivtv_yuv_udma_stream_frame(struct ivtv *itv, void __user *src)
{
struct yuv_playback_info *yi = &itv->yuv_info;
struct ivtv_dma_frame dma_args;
+ int res;
ivtv_yuv_setup_stream_frame(itv);
/* We only need to supply source addresses for this */
dma_args.y_source = src;
dma_args.uv_source = src + 720 * ((yi->v4l2_src_h + 31) & ~31);
- return ivtv_yuv_udma_frame(itv, &dma_args);
+ /* Wait for frame DMA. Note that serialize_lock is locked,
+ so to allow other processes to access the driver while
+ we are waiting unlock first and later lock again. */
+ mutex_unlock(&itv->serialize_lock);
+ res = ivtv_yuv_udma_frame(itv, &dma_args);
+ mutex_lock(&itv->serialize_lock);
+ return res;
}
/* IVTV_IOC_DMA_FRAME ioctl handler */
int ivtv_yuv_prep_frame(struct ivtv *itv, struct ivtv_dma_frame *args)
{
-/* IVTV_DEBUG_INFO("yuv_prep_frame\n"); */
+ int res;
+/* IVTV_DEBUG_INFO("yuv_prep_frame\n"); */
ivtv_yuv_next_free(itv);
ivtv_yuv_setup_frame(itv, args);
- return ivtv_yuv_udma_frame(itv, args);
+ /* Wait for frame DMA. Note that serialize_lock is locked,
+ so to allow other processes to access the driver while
+ we are waiting unlock first and later lock again. */
+ mutex_unlock(&itv->serialize_lock);
+ res = ivtv_yuv_udma_frame(itv, args);
+ mutex_lock(&itv->serialize_lock);
+ return res;
}
void ivtv_yuv_close(struct ivtv *itv)
@@ -1174,7 +1188,9 @@ void ivtv_yuv_close(struct ivtv *itv)
int h_filter, v_filter_1, v_filter_2;
IVTV_DEBUG_YUV("ivtv_yuv_close\n");
+ mutex_unlock(&itv->serialize_lock);
ivtv_waitq(&itv->vsync_waitq);
+ mutex_lock(&itv->serialize_lock);
yi->running = 0;
atomic_set(&yi->next_dma_frame, -1);