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Date:   Thu, 13 Jul 2023 08:07:57 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Daniel Golle <daniel@makrotopia.org>
Cc:     netdev@vger.kernel.org, linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
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        Jakub Kicinski <kuba@kernel.org>,
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        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        =?iso-8859-1?Q?Bj=F8rn?= Mork <bjorn@mork.no>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Greg Ungerer <gerg@kernel.org>
Subject: Re: [PATCH v2 net-next 4/9] net: ethernet: mtk_eth_soc: increase
 MAX_DEVS to 3
Message-ID: <ZK+izTulIcse2aG5@shell.armlinux.org.uk>
References: <cover.1689012506.git.daniel@makrotopia.org>
 <2cc8012ec538106c6bcf22a40b647ec342e687a8.1689012506.git.daniel@makrotopia.org>
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Sender: Russell King (Oracle) <linux@armlinux.org.uk>
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On Thu, Jul 13, 2023 at 03:18:52AM +0100, Daniel Golle wrote:
> From: Lorenzo Bianconi <lorenzo@kernel.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@kernel.org>
> Signed-off-by: Daniel Golle <daniel@makrotopia.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.

-- 
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