From: Jeff Johnson <quic_jjohnson@quicinc.com>
To: Duoming Zhou <duoming@zju.edu.cn>,
<linux-wireless@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <amitkarwar@gmail.com>, <ganapathi017@gmail.com>,
<sharvari.harisangam@nxp.com>, <huxinming820@gmail.com>,
<kvalo@kernel.org>, <davem@davemloft.net>, <edumazet@google.com>,
<kuba@kernel.org>, <pabeni@redhat.com>, <netdev@vger.kernel.org>,
<gregkh@linuxfoundation.org>, <johannes@sipsolutions.net>,
<rafael@kernel.org>
Subject: Re: [PATCH v4 1/2] devcoredump: remove the useless gfp_t parameter in dev_coredumpv
Date: Thu, 2 Jun 2022 13:32:48 -0700 [thread overview]
Message-ID: <e8d9d010-7fa1-da61-feeb-43f0a101a323@quicinc.com> (raw)
In-Reply-To: <338a65fe8f30d23339cfc09fe1fb7be751ad655b.1654175941.git.duoming@zju.edu.cn>
On 6/2/2022 6:33 AM, Duoming Zhou wrote:
> The dev_coredumpv() could not be used in atomic context, because
> it calls kvasprintf_const() and kstrdup() with GFP_KERNEL parameter.
> The process is shown below:
>
> dev_coredumpv(..., gfp_t gfp)
> dev_coredumpm
> 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 changes the
> gfp_t parameter of dev_coredumpm() to GFP_KERNEL in order to show
> dev_coredumpv() could not be used in atomic context.
shouldn't you remove the gfp parameter to dev_coredumpm() as well since
it is actually within that function where dev_set_name() is called which
cannot be done in atomic context?
next prev parent reply other threads:[~2022-06-02 20:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-02 13:33 [PATCH v4 0/2] Remove extra param of dev_coredumpv and fix bugs Duoming Zhou
2022-06-02 13:33 ` [PATCH v4 1/2] devcoredump: remove the useless gfp_t parameter in dev_coredumpv Duoming Zhou
2022-06-02 20:32 ` Jeff Johnson [this message]
2022-06-03 0:42 ` duoming
2022-06-02 13:33 ` [PATCH v4 2/2] mwifiex: fix sleep in atomic context bugs caused by dev_coredumpv Duoming Zhou
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