linux-kernel - Re: [PATCH 2/2] iommu/arm-smmu: Propagate errors from platform_get

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Date:   Thu, 23 Dec 2021 14:19:21 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Will Deacon <will@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Rob Clark <robdclark@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org
Cc:     Xin Tan <tanxin.ctf@...il.com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 2/2] iommu/arm-smmu: Propagate errors from
 platform_get_irq()

On 2021-12-23 13:00, Lad Prabhakar wrote:
> The driver overrides the error code returned by platform_get_irq() to
> -ENODEV. Switch to propagating the error code upstream so that errors
> such as -EPROBE_DEFER are handled.

I wouldn't usually expect an SMMU to be wired up to a secondary 
interrupt controller that could cause deferral, but on the other hand I 
don't think there's any good reason *not* to propagate the original 
error anyway, so sure, why not.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Fixes: 9ec36cafe43b ("of/irq: do irq resolution in platform_get_irq")
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>   drivers/iommu/arm/arm-smmu/arm-smmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index 4844cd075644..6cf5612efcda 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -2129,7 +2129,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
>   		int irq = platform_get_irq(pdev, i);
>   
>   		if (irq < 0)
> -			return -ENODEV;
> +			return irq;
>   		smmu->irqs[i] = irq;
>   	}
>