linux-kernel - [PATCH v2 0/2] staging: r8188eu: Use kzalloc() with GFP

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Message-Id: <20220208180426.27455-1-fmdefrancesco@gmail.com>
Date:   Tue,  8 Feb 2022 19:04:24 +0100
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH v2 0/2] staging: r8188eu: Use kzalloc() with GFP_ATOMIC in atomic context

Use the GFP_ATOMIC flag of kzalloc() in two memory allocation in rtw_set_key().
This function is not allowed to sleep because it executes in atomic context. With
the GFP_ATOMIC type flag, the allocation is high priority and cannot sleep.

This issue is detected by Smatch which emits the following warning:
drivers/staging/r8188eu/core/rtw_mlme.c:1603 rtw_set_key() warn: sleeping in atomic context

Before the above-mentioned changes, checkpatch.pl reports the following issues:

CHECK: Prefer kzalloc(sizeof(*pcmd)...) over kzalloc(sizeof(struct cmd_obj)...)
+       pcmd = kzalloc(sizeof(struct cmd_obj), GFP_ATOMIC);

CHECK: Prefer kzalloc(sizeof(*psetkeyparm)...) over kzalloc(sizeof(struct setkey_parm)...)
+       psetkeyparm = kzalloc(sizeof(struct setkey_parm), GFP_ATOMIC).

According to the above "CHECK[S]", use the preferred style in the two kzalloc().

Changes from v1: Split one patch into two according to a requirement by
Greg Kroah-Hartman.

Fabio M. De Francesco (2):
  staging: r8188eu: Use size of dereferenced pointers in kzalloc()
  staging: r8188eu: Use kzalloc() with GFP_ATOMIC in atomic context

 drivers/staging/r8188eu/core/rtw_mlme.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.34.1