netdev - Re: [PATCH net-next v4 13/16] net: airoha: Introduce Airoha NPU support

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Message-ID: <20250218132756.GU1615191@kernel.org>
Date: Tue, 18 Feb 2025 13:27:56 +0000
From: Simon Horman <horms@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
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>,
	Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"Chester A. Unal" <chester.a.unal@...nc9.com>,
	Daniel Golle <daniel@...rotopia.org>,
	DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [PATCH net-next v4 13/16] net: airoha: Introduce Airoha NPU
 support

On Mon, Feb 17, 2025 at 08:23:43PM +0100, Lorenzo Bianconi wrote:

...

> > > +	err = devm_request_irq(dev, irq, airoha_npu_mbox_handler,
> > > +			       IRQF_SHARED, "airoha-npu-mbox", npu);
> > > +	if (err)
> > > +		return err;
> > > +
> > > +	for (i = 0; i < ARRAY_SIZE(npu->cores); i++) {
> > > +		struct airoha_npu_core *core = &npu->cores[i];
> > > +
> > > +		spin_lock_init(&core->lock);
> > > +		core->npu = npu;
> > > +
> > > +		irq = platform_get_irq(pdev, i + 1);
> > > +		if (irq < 0)
> > > +			return err;

...

> > Should this return irq rather than err?
> 
> are you referring to devm_request_irq()?
> 
> https://elixir.bootlin.com/linux/v6.13.2/source/include/linux/interrupt.h#L215
> https://elixir.bootlin.com/linux/v6.13.2/source/kernel/irq/devres.c#L52
> 
> I guess it returns 0 on success and a negative value in case of error.

Hi Lorenzo,

Sorry, somehow I completely messed-up trimming context and managed to make
things utterly confusing.

I've trimmed things again, and it is the platform_get_irq() call
not far above this line that I'm referring to. It assigns the
return value of a function to irq, tests irq, but returns err.

It is one of (at least) two calls to platform_get_irq() in airoha_npu_probe().