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[109.252.170.211]) by smtp.googlemail.com with ESMTPSA id e14sm50128ljp.15.2020.09.29.22.20.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Sep 2020 22:20:50 -0700 (PDT) Subject: Re: [PATCH v2 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev From: Dmitry Osipenko To: Nicolin Chen , thierry.reding@gmail.com, joro@8bytes.org, krzk@kernel.org Cc: vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20200930003013.31289-1-nicoleotsuka@gmail.com> <20200930003013.31289-3-nicoleotsuka@gmail.com> Message-ID: <931eb16b-4529-2c20-c696-c57a9138aded@gmail.com> Date: Wed, 30 Sep 2020 08:20:50 +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 30.09.2020 08:10, Dmitry Osipenko пишет: > 30.09.2020 03:30, Nicolin Chen пишет: >> static void tegra_smmu_release_device(struct device *dev) > > The tegra_get_memory_controller() uses of_find_device_by_node(), hence > tegra_smmu_release_device() should put_device(mc) in order to balance > back the refcounting. > Actually, the put_device(mc) should be right after tegra_get_memory_controller() in tegra_smmu_probe_device() because SMMU is a part of MC, hence MC can't just go away.