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

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Message-ID: <ZK_b4s6cQd-lhz1Y@makrotopia.org>
Date:   Thu, 13 Jul 2023 12:11:30 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
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 08:07:57AM +0100, Russell King (Oracle) wrote:
> 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.

This is the case already, so the above if-clause can be dropped.
I will do so in v3.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/pcs/pcs-mtk-lynxi.c#n291