On Tue, Aug 4, 2020 at 5:23 AM Vikash Garodia <"Vikash
Garodia"@qti.qualcomm.com> wrote:
>
> From: Vikash Garodia <vgarodia@xxxxxxxxxxxxxx>
>
> There are few list handling issues while adding and deleting
> node in the registered buf list in the driver.
> 1. list addition - buffer added into the list during buf_init
> while not deleted during cleanup.
> 2. list deletion - In capture streamoff, the list was reinitialized.
> As a result, if any node was present in the list, it would
> lead to issue while cleaning up that node during buf_cleanup.
>
> Corresponding call traces below:
> [ 165.751014] Call trace:
> [ 165.753541] __list_add_valid+0x58/0x88
> [ 165.757532] venus_helper_vb2_buf_init+0x74/0xa8 [venus_core]
> [ 165.763450] vdec_buf_init+0x34/0xb4 [venus_dec]
> [ 165.768271] __buf_prepare+0x598/0x8a0 [videobuf2_common]
> [ 165.773820] vb2_core_qbuf+0xb4/0x334 [videobuf2_common]
> [ 165.779298] vb2_qbuf+0x78/0xb8 [videobuf2_v4l2]
> [ 165.784053] v4l2_m2m_qbuf+0x80/0xf8 [v4l2_mem2mem]
> [ 165.789067] v4l2_m2m_ioctl_qbuf+0x2c/0x38 [v4l2_mem2mem]
> [ 165.794624] v4l_qbuf+0x48/0x58
>
> [ 1797.556001] Call trace:
> [ 1797.558516] __list_del_entry_valid+0x88/0x9c
> [ 1797.562989] vdec_buf_cleanup+0x54/0x228 [venus_dec]
> [ 1797.568088] __buf_prepare+0x270/0x8a0 [videobuf2_common]
> [ 1797.573625] vb2_core_qbuf+0xb4/0x338 [videobuf2_common]
> [ 1797.579082] vb2_qbuf+0x78/0xb8 [videobuf2_v4l2]
> [ 1797.583830] v4l2_m2m_qbuf+0x80/0xf8 [v4l2_mem2mem]
> [ 1797.588843] v4l2_m2m_ioctl_qbuf+0x2c/0x38 [v4l2_mem2mem]
> [ 1797.594389] v4l_qbuf+0x48/0x58
>
> Signed-off-by: Vikash Garodia <vgarodia@xxxxxxxxxxxxxx>
> ---
> drivers/media/platform/qcom/venus/vdec.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 7c4c483d5438..76be14efbfb0 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -1088,8 +1088,6 @@ static int vdec_stop_capture(struct venus_inst *inst)
> break;
> }
>
> - INIT_LIST_HEAD(&inst->registeredbufs);
> -
> return ret;
> }
>
> @@ -1189,6 +1187,14 @@ static int vdec_buf_init(struct vb2_buffer *vb)
> static void vdec_buf_cleanup(struct vb2_buffer *vb)
> {
> struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct venus_buffer *buf = to_venus_buffer(vbuf);
> +
> + mutex_lock(&inst->lock);
> + if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> + if (!list_empty(&inst->registeredbufs))
> + list_del_init(&buf->reg_list);
> + mutex_unlock(&inst->lock);
>
> inst->buf_count--;
> if (!inst->buf_count)
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
Reviewed-by: Fritz Koenig <frkoenig@xxxxxxxxxxxx>
