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Subject[PATCH v4 02/17] media: blackfin: bfin_capture: release buffers in case start_streaming() call back fails
Date
From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>

this patch adds support to release the buffer by calling
vb2_buffer_done(), with state marked as VB2_BUF_STATE_QUEUED
if start_streaming() call back fails.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Scott Jiang <scott.jiang.linux@gmail.com>
Tested-by: Scott Jiang <scott.jiang.linux@gmail.com>
---
drivers/media/platform/blackfin/bfin_capture.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/blackfin/bfin_capture.c b/drivers/media/platform/blackfin/bfin_capture.c
index c6d8b95..2c720bc 100644
--- a/drivers/media/platform/blackfin/bfin_capture.c
+++ b/drivers/media/platform/blackfin/bfin_capture.c
@@ -345,6 +345,7 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
struct ppi_if *ppi = bcap_dev->ppi;
+ struct bcap_buffer *buf, *tmp;
struct ppi_params params;
int ret;

@@ -352,7 +353,7 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 1);
if (ret && (ret != -ENOIOCTLCMD)) {
v4l2_err(&bcap_dev->v4l2_dev, "stream on failed in subdev\n");
- return ret;
+ goto err;
}

/* set ppi params */
@@ -391,7 +392,7 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
if (ret < 0) {
v4l2_err(&bcap_dev->v4l2_dev,
"Error in setting ppi params\n");
- return ret;
+ goto err;
}

/* attach ppi DMA irq handler */
@@ -399,12 +400,21 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
if (ret < 0) {
v4l2_err(&bcap_dev->v4l2_dev,
"Error in attaching interrupt handler\n");
- return ret;
+ goto err;
}

reinit_completion(&bcap_dev->comp);
bcap_dev->stop = false;
+
return 0;
+
+err:
+ list_for_each_entry_safe(buf, tmp, &bcap_dev->dma_queue, list) {
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_QUEUED);
+ }
+
+ return ret;
}

static void bcap_stop_streaming(struct vb2_queue *vq)
--
2.1.0


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