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([118.193.39.24]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d14da67e21sm17661175ad.37.2026.08.08.03.57.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 08 Aug 2026 03:57:10 -0700 (PDT) From: Guangshuo Li To: Linus Walleij , Vinod Koul , Frank Li , Srinidh Kasagar , Andrew Morton , Dan Williams , linux-arm-kernel@lists.infradead.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH] dmaengine: ste_dma40: fix autosuspend cleanup on probe failure Date: Sat, 8 Aug 2026 18:56:57 +0800 Message-ID: <20260808105657.2762974-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" d40_probe() calls pm_runtime_use_autosuspend(), but its error path 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 cleanup, this reference is not dropped and usage_count remains unbalanced. Add the missing pm_runtime_dont_use_autosuspend() call to the probe failure path before disabling runtime PM. This issue was found by manual code inspection. Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li Reviewed-by: Linus Walleij --- drivers/dma/ste_dma40.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 0d9ffa3e2663..e2ad50e0fec4 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -3654,6 +3654,7 @@ static int __init d40_probe(struct platform_device *p= dev) regulator_disable(base->lcpa_regulator); regulator_put(base->lcpa_regulator); } + pm_runtime_dont_use_autosuspend(base->dev); pm_runtime_disable(base->dev); =20 report_failure: --=20 2.43.0