linux-kernel - Re: [PATCH v3] staging: r8188eu: Use kzalloc() with GFP

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Date:   Sun, 07 Nov 2021 12:43:51 +0100
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: r8188eu: Use kzalloc() with GFP_ATOMIC in atomic context

On Monday, November 1, 2021 8:18:47 PM CET Fabio M. De Francesco wrote:
> Use the GFP_ATOMIC flag of kzalloc() with two memory allocation in
> report_del_sta_event(). This function is called while holding spinlocks,
> therefore it is not allowed to sleep. With the GFP_ATOMIC type flag, the
> allocation is high priority and must not sleep.
> 
> This issue is detected by Smatch which emits the following warning:
> "drivers/staging/r8188eu/core/rtw_mlme_ext.c:6848 report_del_sta_event()
> warn: sleeping in atomic context".
> 
> After the change, the post-commit hook output the following message:
> "CHECK: Prefer kzalloc(sizeof(*pcmd_obj)...) over
> kzalloc(sizeof(struct cmd_obj)...)".
> 
> According to the above "CHECK", use the preferred style in the first
> kzalloc().
> 
> Fixes: 79f712ea994d ("staging: r8188eu: Remove wrappers for kalloc() and 
kzalloc()")
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
> 
> v2->v3: Add the "Fixes:" tag, as requested by Greg Kroah-Hartman.
> 
> v1->v2: Fix an error that I introduced with an incorrect copy-paste
>         of the sizeof() operator.
> 
>  drivers/staging/r8188eu/core/rtw_mlme_ext.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Hello Greg,

I've noticed that you have already applied recent changes to drivers/staging  
up to the patches of November 6th, but my patch is not among them. 

This patch has already been acked by Larry and I'm not sure if I should send 
a v4 with his "Acked-by" tag or if you can add it by yourself when applying 
to your tree.

Please let me know if there is something that prevents this patch to be 
applied. I have no problem in changing / adding whatever it is needed.

Thanks,

Fabio M. De Francesco