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[109.252.91.252]) by smtp.googlemail.com with ESMTPSA id u20sm326506lfo.156.2020.10.02.07.50.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Oct 2020 07:50:09 -0700 (PDT) Subject: Re: [PATCH v4 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe_device() From: Dmitry Osipenko To: Nicolin Chen , thierry.reding@gmail.com, joro@8bytes.org Cc: vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20201002060807.32138-1-nicoleotsuka@gmail.com> <20201002060807.32138-3-nicoleotsuka@gmail.com> Message-ID: <0c66bab9-0132-d3fb-ea4e-de1278cf2b04@gmail.com> Date: Fri, 2 Oct 2020 17:50:08 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 02.10.2020 17:22, Dmitry Osipenko пишет: >> static int tegra_smmu_of_xlate(struct device *dev, >> struct of_phandle_args *args) >> { >> + struct platform_device *iommu_pdev = of_find_device_by_node(args->np); >> + struct tegra_mc *mc = platform_get_drvdata(iommu_pdev); >> u32 id = args->args[0]; >> >> + of_node_put(args->np); >> + >> + if (!mc || !mc->smmu) >> + return -EPROBE_DEFER; > platform_get_drvdata(NULL) will crash. > Actually, platform_get_drvdata(NULL) can't happen. I overlooked this.