linux-kernel - Re: [PATCH v3] i2c: stm32f7: Add atomic

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Message-ID: <20230903124620.6yrnpbpj37on6wih@zenone.zhora.eu>
Date:   Sun, 3 Sep 2023 14:46:20 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Sean Nyekjaer <sean@...nix.com>
Cc:     Pierre-Yves MORDRET <pierre-yves.mordret@...s.st.com>,
        Alain Volmat <alain.volmat@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-i2c@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] i2c: stm32f7: Add atomic_xfer method to driver

Hi Pierre-Yves, Alain,

mind taking a look here?

[...]

> @@ -357,6 +357,7 @@ struct stm32f7_i2c_dev {
>  	u32 dnf_dt;
>  	u32 dnf;
>  	struct stm32f7_i2c_alert *alert;
> +	bool atomic;

this smells a bit racy here, this works only if the xfer's are
always sequential.

What happens when we receive at the same time two xfer's, one
atomic and one non atomic?

Andi