netdev - Re: [PATCH v6 1/2] devcoredump: remove the useless gfp_t parameter in dev_coredumpv and dev

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Date:   Fri, 10 Jun 2022 15:25:42 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Duoming Zhou <duoming@....edu.cn>, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, briannorris@...omium.org
Cc:     amitkarwar@...il.com, ganapathi017@...il.com,
        sharvari.harisangam@....com, huxinming820@...il.com,
        kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        gregkh@...uxfoundation.org, rafael@...nel.org
Subject: Re: [PATCH v6 1/2] devcoredump: remove the useless gfp_t parameter
 in dev_coredumpv and dev_coredumpm

On Tue, 2022-06-07 at 11:26 +0800, Duoming Zhou wrote:
> The dev_coredumpv() and dev_coredumpm() could not be used in atomic
> context, because they call kvasprintf_const() and kstrdup() with
> GFP_KERNEL parameter. The process is shown below:
> 
> dev_coredumpv(.., gfp_t gfp)
>   dev_coredumpm(.., gfp_t gfp)
>     dev_set_name
>       kobject_set_name_vargs
>         kvasprintf_const(GFP_KERNEL, ...); //may sleep
>           kstrdup(s, GFP_KERNEL); //may sleep
> 
> This patch removes gfp_t parameter of dev_coredumpv() and dev_coredumpm()
> and changes the gfp_t parameter of kzalloc() in dev_coredumpm() to
> GFP_KERNEL in order to show they could not be used in atomic context.
> 
> Fixes: 833c95456a70 ("device coredump: add new device coredump class")
> Signed-off-by: Duoming Zhou <duoming@....edu.cn>
> Reviewed-by: Brian Norris <briannorris@...omium.org>

Sorry I've been buried in WiFi 7 (and kind of still am...)

Reviewed-by: Johannes Berg <johannes@...solutions.net>

johannes