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 dcbab6ad4c26..2ad65eb29832 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);