linux-kernel - Re: [PATCH] iommu: arm-smmu: use devm_request_irq and devm_free

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Date:	Mon, 11 Jul 2016 11:32:55 +0100
From:	Robin Murphy <robin.murphy@....com>
To:	Peng Fan <van.freenix@...il.com>, will.deacon@....com
Cc:	linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: arm-smmu: use devm_request_irq and devm_free_irq

On 04/07/16 10:38, Peng Fan wrote:
> Use devm_request_irq to simplify error handling path,
> when probe smmu device.
> 
> Also devm_{request|free}_irq when init or destroy domain context.
> 
> Signed-off-by: Peng Fan <van.freenix@...il.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> ---
[...]
> @@ -2050,7 +2046,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
>  		dev_err(dev, "removing device with active domains!\n");
>  
>  	for (i = 0; i < smmu->num_global_irqs; ++i)
> -		free_irq(smmu->irqs[i], smmu);
> +		devm_free_irq(smmu->dev, smmu->irqs[i], smmu);

There shouldn't be any need for this at all, since the very next thing
called after drv->remove() is devres_release_all().

Robin.

>  
>  	/* Turn the thing off */
>  	writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
>