linux-kernel - Re: [PATCH RFC 1/4] net: stmmac: platform: read channels irq

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Message-ID: <b9c8580f-e615-4eaa-8878-2fb8d888c0aa@lunn.ch>
Date: Sun, 14 Dec 2025 23:30:43 +0100
From: Andrew Lunn <andrew@...n.ch>
To: jan.petrous@....nxp.com
Cc: 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>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Chester Lin <chester62515@...il.com>,
	Matthias Brugger <mbrugger@...e.com>,
	Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>,
	NXP S32 Linux Team <s32@....com>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 1/4] net: stmmac: platform: read channels irq

On Sun, Dec 14, 2025 at 11:15:37PM +0100, Jan Petrous via B4 Relay wrote:
> From: "Jan Petrous (OSS)" <jan.petrous@....nxp.com>
> 
> Read IRQ resources for all channels, to allow multi IRQ mode
> for platform glue drivers.
> 
> Signed-off-by: Jan Petrous (OSS) <jan.petrous@....nxp.com>
> ---
>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 38 +++++++++++++++++++++-
>  1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 8979a50b5507..29e40253bdfe 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -700,6 +700,9 @@ EXPORT_SYMBOL_GPL(stmmac_pltfr_find_clk);
>  int stmmac_get_platform_resources(struct platform_device *pdev,
>  				  struct stmmac_resources *stmmac_res)
>  {
> +	int i;
> +	char name[8];

Reverse Christmas tree please.

>  	memset(stmmac_res, 0, sizeof(*stmmac_res));
>  
>  	/* Get IRQ information early to have an ability to ask for deferred
> @@ -743,7 +746,40 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
>  
>  	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
>  
> -	return PTR_ERR_OR_ZERO(stmmac_res->addr);
> +	if (IS_ERR(stmmac_res->addr))
> +		return PTR_ERR(stmmac_res->addr);
> +
> +	/* RX channels irq */
> +	for (i = 0; i < MTL_MAX_RX_QUEUES; i++) {
> +		scnprintf(name, 8, "rx-queue-%d", i);

It would be better to use sizeof(name), not 8.

Also, 'rx-queue-' is 9 characters. So i don't see how this can
actually work?

	Andrew