[PATCH v1] media: qcom: iris: Add sanity check for stop streaming

[Wangao Wang <wangao.wang@oss.qualcomm.com>]

Add sanity check in iris_vb2_stop_streaming. If inst->state is
already IRIS_INST_ERROR, we should skip the stream_off operation
because it would still send packets to the firmware.

In iris_vdec_kill_session, inst->state is set to IRIS_INST_ERROR
and session_close is executed, which will kfree(inst_hfi_gen2->packet).
If stop_streaming is called afterward, it will cause a crash.

Signed-off-by: Wangao Wang <wangao.wang@oss.qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_vb2.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/iris/iris_vb2.c b/drivers/media/platform/qcom/iris/iris_vb2.c
index 139b821f7952..c1647fb4f0cc 100644
--- a/drivers/media/platform/qcom/iris/iris_vb2.c
+++ b/drivers/media/platform/qcom/iris/iris_vb2.c
@@ -231,16 +231,20 @@ void iris_vb2_stop_streaming(struct vb2_queue *q)
 		return;
 
 	mutex_lock(&inst->lock);
+	if (inst->state == IRIS_INST_ERROR) {
+		ret = -EBUSY;
+		goto error;
+	}
 
 	if (!V4L2_TYPE_IS_OUTPUT(q->type) &&
 	    !V4L2_TYPE_IS_CAPTURE(q->type))
-		goto exit;
+		goto error;
 
 	ret = iris_session_streamoff(inst, q->type);
 	if (ret)
-		goto exit;
+		goto error;
 
-exit:
+error:
 	iris_helper_buffers_done(inst, q->type, VB2_BUF_STATE_ERROR);
 	if (ret)
 		iris_inst_change_state(inst, IRIS_INST_ERROR);
-- 
2.43.0