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Message-ID: <1acd75d0-67a7-4a17-99c7-707cca305f37@linux.intel.com>
Date: Wed, 25 Oct 2023 19:25:50 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>,
linux-kernel@...r.kernel.org
Cc: baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
Jonathan Hunter <jonathanh@...dia.com>,
Krishna Reddy <vdumpa@...dia.com>,
Robin Murphy <robin.murphy@....com>,
Thierry Reding <thierry.reding@...il.com>,
Will Deacon <will@...nel.org>, iommu@...ts.linux.dev,
linux-tegra@...r.kernel.org
Subject: Re: [PATCH] iommu/tegra-smmu: fix error checking for
debugfs_create_dir()
On 2023/10/25 19:01, Dario Binacchi wrote:
> The return value of debugfs_create_dir() should be checked using the
> IS_ERR() function.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> ---
>
> drivers/iommu/tegra-smmu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
> index e445f80d0226..cd1d80c4c673 100644
> --- a/drivers/iommu/tegra-smmu.c
> +++ b/drivers/iommu/tegra-smmu.c
> @@ -1056,7 +1056,7 @@ DEFINE_SHOW_ATTRIBUTE(tegra_smmu_clients);
> static void tegra_smmu_debugfs_init(struct tegra_smmu *smmu)
> {
> smmu->debugfs = debugfs_create_dir("smmu", NULL);
> - if (!smmu->debugfs)
> + if (IS_ERR(smmu->debugfs))
> return;
This check can be removed, as debugfs_create_file() can handle the case
where @parent is an error pointer.
>
> debugfs_create_file("swgroups", S_IRUGO, smmu->debugfs, smmu,
Best regards,
baolu
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