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Wysocki" , Kedareswara rao Appana , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Tretter , Harini Katakam , Shyam Pandey , dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, git@amd.com Subject: Re: [PATCH v4 3/6] dmaengine: zynqmp_dma: Guard IRQ handler against spurious interrupts Message-ID: References: <20261009-adma-pm-fix-and-per-channel-reset-v4-0-55f5fe409c55@amd.com> <20261009-adma-pm-fix-and-per-channel-reset-v4-3-55f5fe409c55@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261009-adma-pm-fix-and-per-channel-reset-v4-3-55f5fe409c55@amd.com> X-ClientProxiedBy: FR3P281CA0052.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:4a::23) To GV2PR04MB11799.eurprd04.prod.outlook.com (2603:10a6:150:2cf::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GV2PR04MB11799:EE_|GV2PR04MB12630:EE_ X-MS-Office365-Filtering-Correlation-Id: c8efdac0-0ff2-4806-8419-08df267a83bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|23010399003|1800799024|19092799006|376014|7416014|18002099003|261009223027099003|11063799006|4143699003|10067099003|56012099006|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?swpZep+Qi+0ELJrjufSQVIL4pamHXOYik7zQbZv375mp8NVbAT/xQzIUGFpi?= =?us-ascii?Q?t2Ed6J2xg+u2x6s4yNbYg9mhc9jB+H5XkuengNeSBbmQUDVOdXOgWENygxIK?= =?us-ascii?Q?mAnBDodgoes331m7RLehTIE91gh+3s2iwOD91VpeoClNhLfU/JizhDoPUewe?= =?us-ascii?Q?62ivthdt3uwWvkOo+cqgsT0DQkZErPHnmil5mFFwznDj9usUWDYzPyUZUewE?= =?us-ascii?Q?Ywc33B/O7NZbfsGKJGXDFgen+fjlWxlS86jLxx9/I4iWpDKa6bhH+raWxZXz?= =?us-ascii?Q?/7nSfsz6os/cAaPcdcdW5+HypBTclcIGniPDULXUKzxsmVY1rEPCXUVATh4L?= =?us-ascii?Q?+TjzYfpXTZYgk5GFQkFFK6X4pU6jdlxFyOCxu6ZXqFbfSPton1ANiTeVhbvM?= =?us-ascii?Q?Hta8Uvvgh6O3Yfh1jwFA2ZO2g950JaR3flhzjWFJ/E2OSzhJ1hbGEi52ieBB?= =?us-ascii?Q?64oQHXe9zQ+eChIF1Z4NaR7XYr0MWyhao0pH6+wiGufgvI2+QU0wxxD5ntYX?= =?us-ascii?Q?lqmG9Ri5LFSt7+ckqx/VEhzOTEm7OUyPgA1Gw6zWsSSeNFQggWK9EIMRxxtM?= =?us-ascii?Q?aYyB+t3W9YMhB0n1tAv8fgBDfSIOi2jqzOKaYFQOtRki0b6ZlvG3AvReNRad?= =?us-ascii?Q?i3RUvNbJuVkeNqGBCGT26TtBnf0yFvQpV7sQYXxaB+Iut498N9zdm8aSJK3D?= =?us-ascii?Q?5aE374pFvIxEpQFxjEWpMpp9KkXCEWMRUE3OCqlyLI7nTuWNVUU8g1I1Jpal?= =?us-ascii?Q?xYdUebCk5cjF6IuiZFVhcQvjQJ4KN1OIuftFAtosSt9jt09604WVXCcHA7T5?= =?us-ascii?Q?NzIFObS/Sz2eyvOH6UkdUZmdG+v9Hu2i29z0IoTsa8OYscuVQGPhO10EIOqV?= =?us-ascii?Q?e3ySa44pzljNjZF32ZxpM/2yevCJGl01I390AjlxD+lWnktTSV0fSJLUmoMy?= =?us-ascii?Q?Nme1f+cl9HjHAqVA4noghVTtGr7r8UOlm2FJED/GseVnIFEUmmJlyq3KHvec?= =?us-ascii?Q?QH+A7Ny6DfQBkvLO5iwkIafMFi290W5DCvZl/A4S5rgtRu17bzpDTxGnMGvH?= =?us-ascii?Q?qasqQ65Gb6iWhVGrF0BGCtUZt1jwkTwQXH8IhAqq6dIfIJI4GdIlYI0PHprI?= =?us-ascii?Q?gCgHznnuSCIDvfvngeB3VADrVg2ktyXb8sxZ/LZ8zJoAcMLbYmRxWV5crxUN?= =?us-ascii?Q?rOhumUpX3QustMwc+Ssn65w+zsmtFWCrnrYc88jCeaz30TGNxRg+E7Ya29v6?= =?us-ascii?Q?VyYpsqb6DMwiPr12BxZxB/CnPjm5M/hnz/Mb5qnnuD7bO7GU2sMi17nW/TuB?= =?us-ascii?Q?s3rmlljDTWE6WQOU817WWacRn3zeBnQGKxqQtR8vIOyqD7IJF9zMtWX47ARi?= =?us-ascii?Q?d9fm1tIO85Sa2F0DebLSOBhajgc6mAElZ99Ag0WrM8reFGhGNZoKsv8EMZdS?= =?us-ascii?Q?mvgemrwM/Ux42ELxYisA08KbxrRaZPKVUuemfEEz2zT8g5CWnNqGvStpm5fL?= =?us-ascii?Q?Ms5koeZIn4M5dx4nP4Z2HpHBdwTxUEmS/BsDpKc1h/iVMgdR60VaYoqkiGiS?= =?us-ascii?Q?SjwlWwBYIqYjmJRZBcKVfy0drINvyPmT97sh/6WJOSrgkpT6uDt6Vd7tP93M?= =?us-ascii?Q?rAp8LqB2xBcCVI1A7rJd4x6EJ+WZZ8RPUWgXlO+JqufSQJfvEjC9yjgUtn4W?= =?us-ascii?Q?3LYitJ2t06rxvvinOpQ9XRgKGa7QgZHt76+LmJ/KYNTzyYRm6OSyeWd1UgSf?= =?us-ascii?Q?PkzkW9F+nGxJR9cZy52yYb7RwjH67ns5TRQnJdBJYRMx0XIS7PvE?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: c8efdac0-0ff2-4806-8419-08df267a83bc X-MS-Exchange-CrossTenant-AuthSource: GV2PR04MB11799.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Oct 2026 02:59:34.9319 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: JmIX013ufYXgOCBtpUKl/Ty4emTqXb4kk8YcOez4x3SmhRC5yCCfgE2TCT5tf2fm1YNfYI6do9iuty6beu88S6fl8m5hAmLTfjsCQ/YaQNvD2Xsxmh6TthzoVK2UQxnH X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR04MB12630 On Fri, Oct 09, 2026 at 09:30:12AM +0530, Golla Nagendra wrote: > Use the PM_RUNTIME_ACQUIRE_IF_ACTIVE() guard in > zynqmp_dma_irq_handler() to safely handle spurious interrupts that may > arrive while the device is runtime-suspended. > > The guard acquires a runtime PM reference only if the device is active, > returning IRQ_NONE when the device is genuinely runtime-suspended. When > runtime PM is disabled for the device (probe fallback path), the handler > falls through to normal processing since the hardware is still powered. > The reference is released automatically on function exit via the cleanup > infrastructure. > > Fixes: 64c6f7da8c2c ("dmaengine: zynqmp_dma: Add runtime pm support") > Signed-off-by: Golla Nagendra > --- Reviewed-by: Frank Li > drivers/dma/xilinx/zynqmp_dma.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c > index a48106e404e7..b5a5e93e42d5 100644 > --- a/drivers/dma/xilinx/zynqmp_dma.c > +++ b/drivers/dma/xilinx/zynqmp_dma.c > @@ -738,6 +738,10 @@ static irqreturn_t zynqmp_dma_irq_handler(int irq, void *data) > u32 isr, imr, status; > irqreturn_t ret = IRQ_NONE; > > + PM_RUNTIME_ACQUIRE_IF_ACTIVE(chan->dev, pm); > + if (PM_RUNTIME_ACQUIRE_ERR(&pm)) > + return IRQ_NONE; > + > isr = readl(chan->regs + ZYNQMP_DMA_ISR); > imr = readl(chan->regs + ZYNQMP_DMA_IMR); > status = isr & ~imr; > > -- > 2.43.7 >