linux-kernel - Re: [PATCH] HID: usbkbd: Avoid GFP_ATOMIC when GFP

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Message-ID: <nycvar.YFH.7.76.2106151050520.18969@cbobk.fhfr.pm>
Date:   Tue, 15 Jun 2021 10:50:58 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: usbkbd: Avoid GFP_ATOMIC when GFP_KERNEL is
 possible

On Sat, 29 May 2021, Hyeonggon Yoo wrote:

> usb_kbd_alloc_mem is called in usb_kbd_probe, which is
> not in atomic context. So constraints can be relaxed here.
> 
> Use GFP_KERNEL instead of GFP_ATOMIC.
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> ---
>  drivers/hid/usbhid/usbkbd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/usbhid/usbkbd.c b/drivers/hid/usbhid/usbkbd.c
> index e22434dfc9ef..df02002066ce 100644
> --- a/drivers/hid/usbhid/usbkbd.c
> +++ b/drivers/hid/usbhid/usbkbd.c
> @@ -239,11 +239,11 @@ static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
>  		return -1;
>  	if (!(kbd->led = usb_alloc_urb(0, GFP_KERNEL)))
>  		return -1;
> -	if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
> +	if (!(kbd->new = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbd->new_dma)))
>  		return -1;
>  	if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
>  		return -1;
> -	if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
> +	if (!(kbd->leds = usb_alloc_coherent(dev, 1, GFP_KERNEL, &kbd->leds_dma)))
>  		return -1;
>  
>  	return 0;

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs