[PATCH v3] 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_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.

Fixes: 11712ce70f8e5 ("media: iris: implement vb2 streaming ops")

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Dikshita Agarwal <dikshita.agarwal@oss.qualcomm.com>
Signed-off-by: Wangao Wang <wangao.wang@oss.qualcomm.com>
---
Changes in v3:
- Add Fixes tag.
- Link to v2: https://lore.kernel.org/r/20251021-iris_add_sanity_check-v2-1-476b3107a8ef@oss.qualcomm.com

Changes in v2:
- Remove redundant ret assignment in ERROR state.
- Perform error handling according to the value of ret.
- Link to v1: https://lore.kernel.org/r/20251016072517.4845-1-wangao.wang@oss.qualcomm.com
---
 drivers/media/platform/qcom/iris/iris_vb2.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/iris/iris_vb2.c b/drivers/media/platform/qcom/iris/iris_vb2.c
index 139b821f7952feb33b21a7045aef9e8a4782aa3c..db8768d8a8f61c9ceb04e423d0a769d35114e20e 100644
--- a/drivers/media/platform/qcom/iris/iris_vb2.c
+++ b/drivers/media/platform/qcom/iris/iris_vb2.c
@@ -231,6 +231,8 @@ void iris_vb2_stop_streaming(struct vb2_queue *q)
 		return;
 
 	mutex_lock(&inst->lock);
+	if (inst->state == IRIS_INST_ERROR)
+		goto exit;
 
 	if (!V4L2_TYPE_IS_OUTPUT(q->type) &&
 	    !V4L2_TYPE_IS_CAPTURE(q->type))
@@ -241,10 +243,10 @@ void iris_vb2_stop_streaming(struct vb2_queue *q)
 		goto exit;
 
 exit:
-	iris_helper_buffers_done(inst, q->type, VB2_BUF_STATE_ERROR);
-	if (ret)
+	if (ret) {
+		iris_helper_buffers_done(inst, q->type, VB2_BUF_STATE_ERROR);
 		iris_inst_change_state(inst, IRIS_INST_ERROR);
-
+	}
 	mutex_unlock(&inst->lock);
 }
 

---
base-commit: 13863a59e410cab46d26751941980dc8f088b9b3
change-id: 20251021-iris_add_sanity_check-34a0795745b1

Best regards,
-- 
Wangao Wang <wangao.wang@oss.qualcomm.com>