linux-kernel - Re: [PATCH v2] iommu/tegra-smmu: drop error checking for debugfs_create

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Date:   Tue, 28 Nov 2023 12:25:16 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        linux-kernel@...r.kernel.org, Baolu Lu <baolu.lu@...ux.intel.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krishna Reddy <vdumpa@...dia.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>, iommu@...ts.linux.dev,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2] iommu/tegra-smmu: drop error checking for
 debugfs_create_dir()

On Mon, Nov 27, 2023 at 10:27:40AM +0100, Joerg Roedel wrote:
> On Wed, Oct 25, 2023 at 05:25:58PM +0200, Dario Binacchi wrote:
> > The return value of debugfs_create_dir() should be checked using the
> > IS_ERR() function. The patch, however, drops the check statement without
> > fixing it because the subsequent functions (i. e. debugfs_create_file())
> > can handle the case where `@...ent` is an error pointer.
> 
> This deserves a comment in the code explaining why no error checking is
> needed.

This is a duplicate of f7da9c081517 ("iommu/tegra-smmu: Drop unnecessary
error check for for debugfs_create_dir()"), which is already in v6.7-rc1
so I think we can ignore this one.

Thierry

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