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Sun, 23 Aug 2026 08:44:59 -0700 (PDT) Received: from manush ([2406:7400:94:a5e3:6c88:cdf4:5469:310]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-141860c6989sm16795447c88.2.2026.08.23.08.44.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Aug 2026 08:44:59 -0700 (PDT) Message-ID: <6a8b157b.8e75e0cb.2cc15f.4aae@mx.google.com> X-Mailer: git-send-email-equivalent-ps1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Manush Prajwal" To: xingyu.wu@starfivetech.com, ziv.xu@starfivetech.com, wim@linux-watchdog.org Cc: linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org Date: 23 Aug 2026 21:14:59 +0530 Subject: [PATCH v2] watchdog: starfive: fix runtime PM usage counter leak in pm_start Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" starfive_wdt_pm_start() calls pm_runtime_get_sync() and returns its error code directly on failure. Per Documentation/power/runtime_pm.rst, pm_runtime_get_sync() does not drop the usage counter on error, so the caller is expected to release the reference itself. The early return here skips that, leaking a runtime PM usage count on wdd->parent on every failed resume, which prevents the device from being suspended correctly afterwards. Fix it by calling pm_runtime_put_noidle() before returning, mirroring the same balance the counterpart starfive_wdt_pm_stop() already maintains with pm_runtime_put_sync(). v1 only balanced the pm_runtime_get_sync() failure path. As Guenter Roeck and the Sashiko AI review both pointed out, the same leak remains if the subsequent starfive_wdt_start() call fails: the runtime PM reference acquired by pm_runtime_get_sync() would still be held while returning an error, again leaving the device unable to suspend. Drop the reference on that failure path too. Signed-off-by: manushprajwal --- v2: Also drop the pm_runtime reference when starfive_wdt_start() fails, not just when pm_runtime_get_sync() fails, per Guenter Roeck and the Sashiko AI review on v1. drivers/watchdog/starfive-wdt.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/watchdog/starfive-wdt.c b/drivers/watchdog/starfive-wd= t.c index af55adc4a..b1c2d3e4f 100644 --- a/drivers/watchdog/starfive-wdt.c +++ b/drivers/watchdog/starfive-wdt.c @@ -373,8 +373,15 @@ static int starfive_wdt_pm_start(struct watchdog_devic= e *wdd) struct starfive_wdt *wdt =3D watchdog_get_drvdata(wdd); int ret =3D pm_runtime_get_sync(wdd->parent); - if (ret < 0) + if (ret < 0) { + pm_runtime_put_noidle(wdd->parent); return ret; + } - return starfive_wdt_start(wdt); + ret =3D starfive_wdt_start(wdt); + if (ret) + pm_runtime_put_noidle(wdd->parent); + + return ret; } -- 2.46.2.windows.1