linux-kernel - Re: [net-next v3 3/3] net: ethernet: mtk_eth_soc: change code to skip first IRQ completely

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Message-ID: <aE8ja1fbAtvWx2GN@pidgin.makrotopia.org>
Date: Sun, 15 Jun 2025 21:49:43 +0200
From: Daniel Golle <daniel@...rotopia.org>
To: Frank Wunderlich <linux@...web.de>
Cc: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Frank Wunderlich <frank-w@...lic-files.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, Simon Horman <horms@...nel.org>
Subject: Re: [net-next v3 3/3] net: ethernet: mtk_eth_soc: change code to
 skip first IRQ completely

On Sun, Jun 15, 2025 at 05:03:18PM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> On SoCs without MTK_SHARED_INT capability (mt7621 + mt7628) the first
> IRQ (eth->irq[0]) was read but never used. Skip reading it now too.
> 
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 ++++++++---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h |  4 ++--
>  2 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 9aec67c9c6d7..4d7de282b940 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -3346,10 +3346,15 @@ static int mtk_get_irqs(struct platform_device *pdev, struct mtk_eth *eth)
>  		return 0;
>  
>  	for (i = 0; i < MTK_ETH_IRQ_MAX; i++) {
> -		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> -			eth->irq[i] = eth->irq[MTK_ETH_IRQ_SHARED];
> +		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT)) {
> +			if (i == 0)
> +				eth->irq[MTK_ETH_IRQ_SHARED] = platform_get_irq(pdev, i);
> +			else
> +				eth->irq[i] = eth->irq[MTK_ETH_IRQ_SHARED];
> +		} else if (i < 2)  //skip the 1st and 4th IRQ on !MTK_SHARED_INT

Please use conformant comment style, ie. do not use '//' but always use
'/* ... */' instead, on a dedicated line.

> +			eth->irq[i] = platform_get_irq(pdev, i + 1);
>  		else
> -			eth->irq[i] = platform_get_irq(pdev, i);
> +			continue;
>  
>  		if (eth->irq[i] < 0) {
>  			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> index 6b1208d05f79..ff2ae3c80179 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> @@ -643,8 +643,8 @@
>  #define MTK_MAC_FSM(x)		(0x1010C + ((x) * 0x100))
>  
>  #define MTK_ETH_IRQ_SHARED	0
> -#define MTK_ETH_IRQ_TX		1
> -#define MTK_ETH_IRQ_RX		2
> +#define MTK_ETH_IRQ_TX		0
> +#define MTK_ETH_IRQ_RX		1
>  #define MTK_ETH_IRQ_MAX		3

Shouldn't MAX be 1 now?