linux-kernel - Re: [PATCH] bluetooth: btusb: Replace GFP_ATOMIC with GFP_KERNEL in inject_cmd

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Message-Id: <F636E201-BDBC-4D4E-9930-974C40831F03@holtmann.org>
Date:   Mon, 23 Jul 2018 18:05:55 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bluetooth: btusb: Replace GFP_ATOMIC with GFP_KERNEL in
 inject_cmd_complete()

Hi Jia-Ju,

> inject_cmd_complete() is only called by btusb_send_frame_intel(), 
> which is set to hdev->send, and hdev->send() is never 
> called in atomic context.
> 
> inject_cmd_complete() calls bt_skb_alloc() with GFP_ATOMIC, 
> which is not necessary.
> GFP_ATOMIC can be replaced with GFP_KERNEL.
> 
> This is found by a static analysis tool named DCNS written by myself.
> I also manually check the kernel code before reporting it.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
> ---
> drivers/bluetooth/btusb.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

all 6 patches have been applied to bluetooth-next tree.

Regards

Marcel