Hi Ming,
On 11/1/22 09:05, Ming Qian wrote:
> driver need to cancel vpu before releasing the vpu instance,
> but it doesn't want to release the m2m_ctx before
> the release callback of instance is called,
> as driver may access the m2m_ctx in handling some event
> which may be received in releasing instance.
>
> check and cancel the unstopped instance before release.
>
> Fixes: d91d7bc85062 ("media: amphion: release m2m ctx when releasing vpu instance")
> Signed-off-by: Ming Qian <ming.qian@xxxxxxx>
> ---
> drivers/media/platform/amphion/vpu_v4l2.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/media/platform/amphion/vpu_v4l2.c b/drivers/media/platform/amphion/vpu_v4l2.c
> index 99ad2f1c5a53..845fc53d8937 100644
> --- a/drivers/media/platform/amphion/vpu_v4l2.c
> +++ b/drivers/media/platform/amphion/vpu_v4l2.c
> @@ -767,6 +767,23 @@ int vpu_v4l2_open(struct file *file, struct vpu_inst *inst)
> return ret;
> }
>
> +static void vpu_v4l2_check_and_cancel(struct file *file, struct vpu_inst *inst)
> +{
> + struct vb2_queue *vq;
> +
> + vpu_inst_lock(inst);
> +
> + vq = v4l2_m2m_get_src_vq(inst->fh.m2m_ctx);
> + if (vb2_is_streaming(vq))
> + v4l2_m2m_streamoff(file, inst->fh.m2m_ctx, vq->type);
> +
> + vq = v4l2_m2m_get_dst_vq(inst->fh.m2m_ctx);
> + if (vb2_is_streaming(vq))
> + v4l2_m2m_streamoff(file, inst->fh.m2m_ctx, vq->type);
> +
> + vpu_inst_unlock(inst);
This feels weird. This is normally done in v4l2_m2m_ctx_release(), so
if you need to do this here, doesn't that mean perhaps that the order
of releasing things should be changed? I.e., first call v4l2_m2m_ctx_release()
and only afterwards release the vpu instance.
In other words, are you just fixing the symptom rather than the actual
cause?
Regards,
Hans
> +}
> +
> int vpu_v4l2_close(struct file *file)
> {
> struct vpu_dev *vpu = video_drvdata(file);
> @@ -774,6 +791,7 @@ int vpu_v4l2_close(struct file *file)
>
> vpu_trace(vpu->dev, "tgid = %d, pid = %d, inst = %p\n", inst->tgid, inst->pid, inst);
>
> + vpu_v4l2_check_and_cancel(file, inst);
> call_void_vop(inst, release);
> vpu_inst_unregister(inst);
> vpu_inst_put(inst);
