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([152.32.133.247]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3925fc6dab4sm4996353a91.3.2026.08.07.23.20.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 23:20:44 -0700 (PDT) From: Guangshuo Li To: Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Guangshuo Li , Andrey Skvortsov , Sakari Ailus , Kees Cook , Maxime Ripard , linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Subject: [PATCH] bus: sunxi-rsb: fix usage_count leak when autosuspend_delay is negative Date: Sat, 8 Aug 2026 14:20:29 +0800 Message-ID: <20260808062029.2597581-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260807_232045_874062_97C99457 X-CRM114-Status: GOOD ( 10.73 ) 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 sunxi_rsb_probe() calls pm_runtime_use_autosuspend(), but sunxi_rsb_remove() does not call the matching pm_runtime_dont_use_autosuspend() before disabling runtime PM. If the autosuspend delay is set to a negative value while autosuspend is enabled, the runtime PM core increments usage_count to prevent runtime suspend. Without calling pm_runtime_dont_use_autosuspend() during driver teardown, this reference is not dropped and usage_count remains unbalanced. Add the missing pm_runtime_dont_use_autosuspend() call before disabling runtime PM. This issue was found by manual code inspection. Fixes: 4a0dbc12e618 ("bus: sunxi-rsb: Implement runtime power management") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- drivers/bus/sunxi-rsb.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c index daf0ea563e47..cd4c857756cf 100644 --- a/drivers/bus/sunxi-rsb.c +++ b/drivers/bus/sunxi-rsb.c @@ -815,6 +815,7 @@ static void sunxi_rsb_remove(struct platform_device *pdev) struct sunxi_rsb *rsb = platform_get_drvdata(pdev); device_for_each_child(rsb->dev, NULL, sunxi_rsb_remove_devices); + pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_disable(&pdev->dev); sunxi_rsb_hw_exit(rsb); } -- 2.43.0