linux-kernel - RE: [PATCH] ice: Don't use GFP

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Message-ID: <CY4PR1101MB2101D3A3815052A2BD52D600EE019@CY4PR1101MB2101.namprd11.prod.outlook.com>
Date:   Mon, 28 Feb 2022 15:07:33 +0000
From:   "Kaliszczuk, Leszek" <leszek.kaliszczuk@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] ice: Don't use GFP_KERNEL in atomic context


> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Sent: Sunday, January 16, 2022 7:46 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Saleem, Shiraz <shiraz.saleem@...el.com>; Ertman,
> David M <david.m.ertman@...el.com>
> Cc: linux-kernel@...r.kernel.org; kernel-janitors@...r.kernel.org; Christophe
> JAILLET <christophe.jaillet@...adoo.fr>; intel-wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org
> Subject: [PATCH] ice: Don't use GFP_KERNEL in atomic context
> 
> ice_misc_intr() is an irq handler. It should not sleep.
> 
> Use GFP_ATOMIC instead of GFP_KERNEL when allocating some memory.
> 
> Fixes: 348048e724a0 ("ice: Implement iidc operations")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> I've never played a lot with irq handler. My understanding is that they should never
> sleep. So GFP_KERNEL must be avoided. So I guess that this patch is correct.
> 
> However, I don't know if some special cases allow such allocation.
> Any feedback/pointer to a good doc/explanation is welcome :)
> ---
>  drivers/net/ethernet/intel/ice/ice_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Tested-by: Leszek Kaliszczuk <leszek.kaliszczuk@...el.com>