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([2001:250:5800:1000::f280]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cbe8f1af2d8sm1484585a12.10.2026.08.07.23.32.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 23:32:20 -0700 (PDT) From: Guangshuo Li To: Manivannan Sadhasivam , Vivek Pernamitta , Daniele Palmas , Krishna Chaitanya Chundru , Slark Xiao , Qiang Yu , Loic Poulain , mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH] bus: mhi: host: pci_generic: fix usage_count leak when autosuspend_delay is negative Date: Sat, 8 Aug 2026 14:29:16 +0800 Message-ID: <20260808062916.2604668-1-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" mhi_pci_probe() calls pm_runtime_use_autosuspend() when runtime PM is supported, but mhi_pci_remove() does not call the matching pm_runtime_dont_use_autosuspend() during device removal. 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 forbidding runtime PM. This issue was found by manual code inspection. Fixes: d3800c1dce24 ("bus: mhi: pci_generic: Add support for runtime PM") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- drivers/bus/mhi/host/pci_generic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_= generic.c index 0d0d9c7ffa4b..8efff3e0a31c 100644 --- a/drivers/bus/mhi/host/pci_generic.c +++ b/drivers/bus/mhi/host/pci_generic.c @@ -1479,6 +1479,7 @@ static void mhi_pci_remove(struct pci_dev *pdev) struct mhi_pci_device *mhi_pdev =3D pci_get_drvdata(pdev); struct mhi_controller *mhi_cntrl =3D &mhi_pdev->mhi_cntrl; =20 + pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_forbid(&pdev->dev); pci_disable_sriov(pdev); =20 --=20 2.43.0