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Fri, 11 Sep 2026 16:17:46 -0700 Date: Fri, 11 Sep 2026 16:17:44 -0700 From: Nicolin Chen To: Jonathan Cameron CC: , , , , , , , , , , Jean-Philippe Brucker , "Eric Auger" , , , , , , , , , Subject: Re: [PATCH v4 01/15] iommu/arm-smmu-v3: Disable the impl before disabling the SMMU on shutdown Message-ID: References: <61536b87c45164b1f581ee4358574ee7822e212d.1789081084.git.nicolinc@nvidia.com> <178908564506.2841562.10082006196933269469.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <178908564506.2841562.10082006196933269469.b4-review@b4> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002311:EE_|IA0PR12MB8376:EE_ X-MS-Office365-Filtering-Correlation-Id: 7fa3d6ee-229b-4404-9bab-08df105af238 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|7416014|376014|1800799024|82310400026|10067099003|4143699003|11063799006|56012099006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: EEhiuKsZHsjH5I5RYDrW6q25YvjcGVqXM85PkbgPOFMNfwOEktCYxSD3iL/rRkksBJfm1CS9rMX3ScELrantbgpq0u4jX5w+GnccI3a954EsTWGTwXrsr47kGzA4+gi/uqQGjFHTCiZAl7zcnOBGTGj0DtZDALpq1VNc2JdgfJLxUBHG+xyyCSwCNh2yi4HUcxoEo1N2TSmF7umE2MFER9V4ELToq0EBacsC6jAkZJASd+rvbesr85+TYcZj3sURxXa49c+KzIl8j/VSP2KSVY0sluNrkvc7Q05UdpvIEoO4/V0CSmbGl6lDuKzCdfQdvRd76CwLM+NeI8vpayE7fYDOblf97WAIJhqfn/FZdr+xtljdaCoITl6Bnd33xy7kotDDn6EshM2VgzPhS4We6vpXivbkPOYF0HthqSuB70yCfb72ZQtb8LubzCZ4CY0T X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2026 23:18:10.5420 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7fa3d6ee-229b-4404-9bab-08df105af238 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002311.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8376 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260911_161817_572210_0B540233 X-CRM114-Status: GOOD ( 13.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 10, 2026 at 05:14:05PM -0700, Jonathan Cameron wrote: > > arm_smmu_device_shutdown() only calls arm_smmu_device_disable(), and never > > the impl_ops->device_disable() hook. On tegra241-cmdqv, that hook quiesces > > every VINTF through tegra241_vintf_hw_deinit(), which issues a CMD_SYNC on > > the shared CMDQ while it is still enabled. > > > > arm_smmu_disable_action() already runs this hook before disabling the SMMU, > > to cover an unbind or a probe failure, and no devres release ever follows a > > reboot or a kexec to run it again. Have arm_smmu_device_shutdown() call it > > directly, instead of reimplementing part of what it already does. > > > > Fixes: 9ff145a25c5c ("iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown") > > Cc: stable@vger.kernel.org > > Assisted-by: Claude:claude-sonnet-5 > Assisted-by: LLM > > See Documetation/process changes around this. Personally I don't care > either way. Ah, it looks like they changed that recently. I've been following the old format now. Since we need a respin, I can fix all the tags. Nicolin