linux-kernel - Re: [PATCH v2,1/2] media: mediatek: vcodec: adding lock to protect decoder context list

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Message-ID: <df6c8b2b-df56-46c5-933d-e56bf704525f@collabora.com>
Date: Mon, 29 Jan 2024 12:19:00 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Yunfei Dong <yunfei.dong@...iatek.com>,
 Nícolas F . R . A . Prado <nfraprado@...labora.com>,
 Nicolas Dufresne <nicolas.dufresne@...labora.com>,
 Hans Verkuil <hverkuil-cisco@...all.nl>,
 Benjamin Gaignard <benjamin.gaignard@...labora.com>,
 Nathan Hebert <nhebert@...omium.org>, Irui Wang <irui.wang@...iatek.com>
Cc: 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 v2,1/2] media: mediatek: vcodec: adding lock to protect
 decoder context list

Il 29/01/24 03:31, Yunfei Dong ha scritto:
> The ctx_list will be deleted when scp getting unexpected behavior, then the
> ctx_list->next will be NULL, the kernel driver maybe access NULL pointer in
> function vpu_dec_ipi_handler when going through each context, then reboot.
> 
> Need to add lock to protect the ctx_list to make sure the ctx_list->next isn't
> NULL pointer.
> 
> Hardware name: Google juniper sku16 board (DT)
> pstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--)
> pc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec]
> lr : scp_ipi_handler+0xd0/0x194 [mtk_scp]
> sp : ffffffc0131dbbd0
> x29: ffffffc0131dbbd0 x28: 0000000000000000
> x27: ffffff9bb277f348 x26: ffffff9bb242ad00
> x25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4
> x23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0
> x21: 0000000000000010 x20: ffffff9b050ea328
> x19: ffffffc0131dbc08 x18: 0000000000001000
> x17: 0000000000000000 x16: ffffffd2d461c6e0
> x15: 0000000000000242 x14: 000000000000018f
> x13: 000000000000004d x12: 0000000000000000
> x11: 0000000000000001 x10: fffffffffffffff0
> x9 : ffffff9bb6e793a8 x8 : 0000000000000000
> x7 : 0000000000000000 x6 : 000000000000003f
> x5 : 0000000000000040 x4 : fffffffffffffff0
> x3 : 0000000000000020 x2 : ffffff9bb6e79080
> x1 : 0000000000000010 x0 : ffffffc0131dbc08
> Call trace:
> vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)]
> scp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)]
> mt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)]
> scp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)]
> irq_thread_fn+0x38/0x94
> irq_thread+0x100/0x1c0
> kthread+0x140/0x1fc
> ret_from_fork+0x10/0x30
> Code: 54000088 f94ca50a eb14015f 54000060 (f9400108)
> ---[ end trace ace43ce36cbd5c93 ]---
> Kernel panic - not syncing: Oops: Fatal exception
> SMP: stopping secondary CPUs
> Kernel Offset: 0x12c4000000 from 0xffffffc010000000
> PHYS_OFFSET: 0xffffffe580000000
> CPU features: 0x08240002,2188200c
> Memory Limit: none
> 
> 'Fixes: 655b86e52eac ("media: mediatek: vcodec: Fix possible invalid memory access for decoder")'

Hello Yunfei,

You've sent two patches as a v2, but:
  - The two patches are identical (!) apart from the commit message?!
  - It's Fixes: xxxx , not 'Fixes: xxxx' (please remove the quotes!)
  - There's no changelog from v1, so, what changed in v2?!

Cheers,
Angelo

> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> ---
>   .../platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c      | 4 ++--
>   .../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c    | 5 +++++
>   .../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h    | 2 ++
>   drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c | 2 ++
>   4 files changed, 11 insertions(+), 2 deletions(-)
>