linux-kernel - Re: Re: [PATCH] ASoC: codecs: Check for error pointer after calling devm_regmap_init

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Message-Id: <20220113015607.1124916-1-jiasheng@iscas.ac.cn>
Date:   Thu, 13 Jan 2022 09:56:07 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     broonie@...nel.org
Cc:     cezary.rojewski@...el.com, srinivas.kandagatla@...aro.org,
        bgoswami@...eaurora.org, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: Re: [PATCH] ASoC: codecs: Check for error pointer after calling devm_regmap_init_mmio

On Wed, Jan 12, 2022 at 10:20:34PM +0800, Mark Brown wrote:
>> The devm_regmap_init_mmio() may return error pointer under certain
>> circumstances, for example the possible failure of the kzalloc() in
>> regmap_mmio_gen_context(), which is called by devm_regmap_init_mmio().
>
> This doesn't apply against current code, please check and resend.

I checked linux-5.16, and don't think what I said is not against the
latest code.
The devm_regmap_init_mmio() is defined as devm_regmap_init_mmio_clk()
in `include/linux/regmap.h`.
And in the same file, the devm_regmap_init_mmio_clk() is defined as
__devm_regmap_init_mmio_clk().
Then, __devm_regmap_init_mmio_clk() -> regmap_mmio_gen_context() ->
kzalloc().
So I have no idea what's wrong.
Maybe I didn't write the commit message clear.
Please give me more detail.

Sincerely thanks,
Jiang