linux-kernel - Re: [PATCH 12/35] media: platform: mtk-mdp3: Use refcount_t for job

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Date: Tue, 23 Apr 2024 13:46:33 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Martin Tuma <martin.tuma@...iteqautomotive.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
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 <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
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Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev,
 linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 12/35] media: platform: mtk-mdp3: Use refcount_t for
 job_count

On 15/04/2024 20:34, Ricardo Ribalda wrote:
> Use an API that resembles more the actual use of job_count.
> 
> Found by cocci:
> drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c:527:5-24: WARNING: atomic_dec_and_test variation before object free at line 541.
> drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c:578:6-25: WARNING: atomic_dec_and_test variation before object free at line 581.

Same comment here as per the previous patch.

You should explain in terms of the memory ordering that refcount_t gives 
so that the intention of the WARNING and the API change is well 
communicated.

---
bod