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([36.255.223.70]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-390b37eac8csm2200388a91.4.2026.08.07.22.15.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 22:15:52 -0700 (PDT) From: Guangshuo Li To: Marcel Holtmann , Luiz Augusto von Dentz , Frederic Danis , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH] Bluetooth: hci_bcm: fix usage_count leak when autosuspend_delay is negative Date: Sat, 8 Aug 2026 13:15:32 +0800 Message-ID: <20260808051532.2553947-1-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" bcm_request_irq() calls pm_runtime_use_autosuspend(), but bcm_close() does not call the matching pm_runtime_dont_use_autosuspend() when tearing down 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: e88ab30d3669 ("Bluetooth: hci_bcm: Add suspend/resume runtime PM fun= ctions") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- drivers/bluetooth/hci_bcm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index 1a4fc3882fd2..cc419e1960de 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -547,6 +547,7 @@ static int bcm_close(struct hci_uart *hu) if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) { devm_free_irq(bdev->dev, bdev->irq, bdev); device_init_wakeup(bdev->dev, false); + pm_runtime_dont_use_autosuspend(bdev->dev); pm_runtime_disable(bdev->dev); } =20 --=20 2.43.0