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[2003:e4:1f1b:d600:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id z17-20020a170906241100b0099cf91fe297sm10257349eja.13.2023.09.07.00.44.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Sep 2023 00:44:43 -0700 (PDT) Date: Thu, 7 Sep 2023 09:44:41 +0200 From: Thierry Reding To: Jinjie Ruan Cc: linux-tegra@vger.kernel.org, iommu@lists.linux.dev, baolu.lu@linux.intel.com, Krishna Reddy , Joerg Roedel , Will Deacon , Robin Murphy , Jonathan Hunter Subject: Re: [PATCH v2] iommu/tegra-smmu: Drop unnecessary error check for for debugfs_create_dir() Message-ID: References: <20230901073056.1364755-1-ruanjinjie@huawei.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="HvtXWZfmTjWuBMT6" Content-Disposition: inline In-Reply-To: <20230901073056.1364755-1-ruanjinjie@huawei.com> User-Agent: Mutt/2.2.10 (2023-03-25) Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org --HvtXWZfmTjWuBMT6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 01, 2023 at 03:30:56PM +0800, Jinjie Ruan wrote: > The debugfs_create_dir() function returns error pointers. > It never returns NULL. >=20 > As Baolu suggested, this patch removes the error checking for > debugfs_create_dir in tegra-smmu.c. This is because the DebugFS kernel API > is developed in a way that the caller can safely ignore the errors that > occur during the creation of DebugFS nodes. The debugfs APIs have > a IS_ERR() judge in start_creating() which can handle it gracefully. So > these checks are unnecessary. >=20 > Fixes: d1313e7896e9 ("iommu/tegra-smmu: Add debugfs support") > Signed-off-by: Jinjie Ruan > Suggested-by: Baolu Lu > --- > v2: > - Remove the err check instead of using IS_ERR to replace NULL check. > - Update the commit message and title. > --- > drivers/iommu/tegra-smmu.c | 2 -- > 1 file changed, 2 deletions(-) Acked-by: Thierry Reding --HvtXWZfmTjWuBMT6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEiOrDCAFJzPfAjcif3SOs138+s6EFAmT5f2cACgkQ3SOs138+ s6GGQw/+Ncn2h8nFPL3OqrcC1az2G+luBQnIRXGLvBs+7LJRMW6CgmhxPvgxWIai eAt4lXhLCEU9OluStu/79xJXExRJpVOftYb2918gMfsp5VMWq+4tc3uIRo6bbr9P LTax1jEg4c6cWQjbDGBU3qXZhMxBdc2dr8b7szlbxLrCOiL4ZYakStnxlnO2EEZT buWVhRhLNsHoYjgUUrp1mSNg0EcfZqeKuE6VwXQ6Q1cI6c/ZekthJmlh35HOU/Uz THB00C67niQLkkPor8/xtpESrL6bUtfblHbDVAjU4etiamfe3mGClX6cJjltuLnl lpYghVrbk4ZMjzudoQsX53PL6465ykf8LOseMO6lJ6wWyXxEMetNy46McP5mwnLn /ANRNqMi0TUbBgcXUj81eVhQ4UIZJGHZoGwGlnvntWb5/QNZOhLKSweWQ8VSC6ZM pC65yGUeS0ZawAovOtsqVCEdxserfREsr2r8lsUPV1ITO/nPa+OndPMRJ2XI6Acu lYJmfiHvRweXodiW8V+zu3WsWm3H7dWmOlyDlnUSKyhWzIA8cRhLKCWqh/9fQG0t xdoK+4a0UK6LzfDvLKqfkwx70vzrL4vS3Kpv+h672KmQdaxRlwPUKUX4THj+hFxe 983l9GGsGQlP6mRMvoumjufwdZBWauTfWfb5q4XymGwDSb9sk9Y= =HMdc -----END PGP SIGNATURE----- --HvtXWZfmTjWuBMT6--