linux-kernel - Re: [PATCH 07/15] iommu/arm-smmu: Fix uninitilized variable warning

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Date:   Mon, 16 Mar 2020 16:47:22 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 07/15] iommu/arm-smmu: Fix uninitilized variable warning

On Tue, Mar 10, 2020 at 10:12:21AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Some unrelated changes in the iommu code caused a new warning to
> appear in the arm-smmu driver:
> 
>   CC      drivers/iommu/arm-smmu.o
> drivers/iommu/arm-smmu.c: In function 'arm_smmu_add_device':
> drivers/iommu/arm-smmu.c:1441:2: warning: 'smmu' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   arm_smmu_rpm_put(smmu);
>   ^~~~~~~~~~~~~~~~~~~~~~
> 
> The warning is a false positive, but initialize the variable to NULL
> to get rid of it.
> 
> Tested-by: Will Deacon <will@...nel.org> # arm-smmu
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

> ---
>  drivers/iommu/arm-smmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 16c4b87af42b..980aae73b45b 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1383,7 +1383,7 @@ struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  
>  static int arm_smmu_add_device(struct device *dev)
>  {
> -	struct arm_smmu_device *smmu;
> +	struct arm_smmu_device *smmu = NULL;
>  	struct arm_smmu_master_cfg *cfg;
>  	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
>  	int i, ret;
> -- 
> 2.17.1
>