linux-kernel - Re: [PATCH v2] media: mediatek: vcodec: fix cancel_work

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Message-ID: <b130377d-4e1a-423c-9e51-c96a3833b51c@notapiano>
Date:   Mon, 12 Jun 2023 14:06:06 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Yunfei Dong <yunfei.dong@...iatek.com>
Cc:     Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Nathan Hebert <nhebert@...omium.org>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] media: mediatek: vcodec: fix cancel_work_sync fail
 with fluster test

On Mon, Jun 12, 2023 at 06:19:39PM +0800, Yunfei Dong wrote:
> Will cause below warning then reboot when exercising the decoder with
> fluster on mt8192-asurada-spherion.
> 
> This deinit function is called on the v4l2 release callback, even though the
> work might not have been initialized as that only happens if/when the codec
> specific 'decode' callback is called (as a result of device_run m2m callback).
> 
> CPU: 5 PID: 2338 Comm: gst-launch-1.0 Tainted: G        W          6.4.0-rc5-next-20230607+ #475
> Hardware name: Google Spherion (rev0 - 3) (DT)
> pstate: 00400009 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : __flush_work.isra.0+0x23c/0x258
> lr : __cancel_work_timer+0x14c/0x1c8
> sp : ffff8000896e3b00
> x29: ffff8000896e3b00 x28: ffff57c3d4079f80 x27: 0000000000000000
> x26: ffff57c3d4079f80 x25: ffffb76395b59dc8 x24: 0000000000000001
> x23: ffffb763928daab8 x22: ffff57c3d4079f80 x21: 0000000000000000
> x20: ffffb763955f6778 x19: ffff57c3cf06f4a0 x18: 0000000000000000
> x17: 000000040044ffff x16: 005000f2b5503510 x15: 0000000000000000
> x14: ffff57c3c03a1f80 x13: ffffa0616a2fc000 x12: 000000003464d91d
> x11: 0000000000000000 x10: 0000000000001b10 x9 : ffffb763928de61c
> x8 : ffff57c3d407baf0 x7 : 0000000000000000 x6 : ffff57c3d4079f80
> x5 : ffff57c3d4079f80 x4 : 0000000000000000 x3 : 0000000000000000
> x2 : ffff8000896e3bf0 x1 : 0000000000000011 x0 : 0000000000000000
> Call trace:
>  __flush_work.isra.0+0x23c/0x258
>  __cancel_work_timer+0x14c/0x1c8
>  cancel_work_sync+0x1c/0x30
>  vdec_msg_queue_deinit+0xac/0xc8
>  vdec_h264_slice_deinit+0x64/0xb8
>  vdec_if_deinit+0x3c/0x68
>  mtk_vcodec_dec_release+0x20/0x40
>  fops_vcodec_release+0x50/0xd8
>  v4l2_release+0x7c/0x100
>  __fput+0x80/0x270
>  ____fput+0x18/0x30
>  task_work_run+0x78/0xe0
>  do_notify_resume+0x29c/0x7f8
>  el0_svc+0xa4/0xb8
>  el0t_64_sync_handler+0xc0/0xc8
>  el0t_64_sync+0x1a8/0x1b0
> ---[ end trace 0000000000000000 ]---
> 
> Fixes: 297160d411e3 ("media: mediatek: vcodec: move core context from device to each instance")
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> Reported-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Hi Yunfei,

thanks for addressing the issue. The warnings are now gone with this patch
applied.

Tested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Thanks,
Nícolas