linux-kernel - Re: [PATCH] octeontx2-pf: Add check for devm

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Message-ID: <Y3y5xpewO/wh6ooB@boxer>
Date:   Tue, 22 Nov 2022 13:00:06 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
CC:     <sgoutham@...vell.com>, <lcherian@...vell.com>,
        <gakula@...vell.com>, <jerinj@...vell.com>, <hkelam@...vell.com>,
        <sbhatta@...vell.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <richardcochran@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] octeontx2-pf: Add check for devm_kcalloc

On Tue, Nov 22, 2022 at 01:54:49PM +0800, Jiasheng Jiang wrote:
> As the devm_kcalloc may return NULL pointer,
> it should be better to add check for the return
> value, as same as the others.
> 
> Fixes: e8e095b3b370 ("octeontx2-af: cn10k: Bandwidth profiles config support")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
> index 7646bb2ec89b..a62c1b322012 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
> @@ -4985,6 +4985,8 @@ static int nix_setup_ipolicers(struct rvu *rvu,
>  		ipolicer->ref_count = devm_kcalloc(rvu->dev,
>  						   ipolicer->band_prof.max,
>  						   sizeof(u16), GFP_KERNEL);
> +		if (!ipolicer->ref_count)
> +			return -ENOMEM;

So every other successful devm_kcalloc() calls in here don't have to be
explicitly freed in case of an error as in the end rvu_nix_init() will
fail and therefore the probe() itself.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

Please also remember to state which tree you are targetting your patch
(this is a fix so you should have [PATCH net])

>  	}
>  
>  	/* Set policer timeunit to 2us ie  (19 + 1) * 100 nsec = 2us */
> -- 
> 2.25.1
>