linux-kernel - Re: [PATCH] iommu/arm-smmu: remove redundant assignment to variable res

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Date:   Fri, 25 Feb 2022 14:32:19 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Colin Ian King <colin.i.king@...il.com>,
        Will Deacon <will@...nel.org>, Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] iommu/arm-smmu: remove redundant assignment to variable
 res

On 2022-02-25 09:32, Colin Ian King wrote:
> The variable res is being assigned a value that isn't being read
> later. The assignment is redundant and can be removed.
> 
> Cleans up clang scan warning:
> drivers/iommu/arm/arm-smmu/arm-smmu.c:2109:10: warning: Although the
> value stored to 'res' is used in the enclosing expression, the value
> is never actually read from 'res' [deadcode.DeadStores]

Thanks Colin, however in general we need to get rid of this 
platform_get_resource() call ASAP anyway, so Will should hopefully be 
picking up either [1] or [2] for 5.18.

Cheers,
Robin.

[1] 
https://lore.kernel.org/linux-arm-kernel/b2a40caaf1622eb35c555074a0d72f4f0513cff9.1645106346.git.robin.murphy@arm.com/
[2] 
https://lore.kernel.org/linux-arm-kernel/20211223130046.9365-2-prabhakar.mahadev-lad.rj@bp.renesas.com/

> Signed-off-by: Colin Ian King <colin.i.king@...il.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 4bc75c4ce402..f83d2c32b5a9 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -2106,7 +2106,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
>   		return PTR_ERR(smmu);
>   
>   	num_irqs = 0;
> -	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) {
> +	while (platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs)) {
>   		num_irqs++;
>   		if (num_irqs > smmu->num_global_irqs)
>   			smmu->num_context_irqs++;