linux-kernel - Re: [PATCH v2 net-next 4/9] net: ethernet: mtk_eth_soc: increase MAX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZK+izTulIcse2aG5@shell.armlinux.org.uk>
Date:   Thu, 13 Jul 2023 08:07:57 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Bjørn Mork <bjorn@...k.no>,
        Florian Fainelli <f.fainelli@...il.com>,
        Greg Ungerer <gerg@...nel.org>
Subject: Re: [PATCH v2 net-next 4/9] net: ethernet: mtk_eth_soc: increase
 MAX_DEVS to 3

On Thu, Jul 13, 2023 at 03:18:52AM +0100, Daniel Golle wrote:
> From: Lorenzo Bianconi <lorenzo@...nel.org>
> 
> This is a preliminary patch to add MT7988 SoC support since it runs 3
> macs instead of 2.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 6 +++++-
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h | 4 ++--
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 7014e0d108b27..7f191e4337dd8 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -4030,8 +4030,12 @@ static void mtk_sgmii_destroy(struct mtk_eth *eth)
>  {
>  	int i;
>  
> -	for (i = 0; i < MTK_MAX_DEVS; i++)
> +	for (i = 0; i < MTK_MAX_DEVS; i++) {
> +		if (!eth->sgmii_pcs[i])
> +			continue;
> +
>  		mtk_pcs_lynxi_destroy(eth->sgmii_pcs[i]);
> +	}

Please instead arrange for mtk_pcs_lynxi_destroy() to be a no-op if it's
passed a NULL pointer, which makes it easier to use in error paths (it
means mtk_pcs_lynxi_destroy() can be called without checks - like
kfree() etc.)

Since error paths don't get often tested, we need to do as much as
possible to make error paths trivial.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!