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Mon, 25 May 2026 08:14:00 -0700 (PDT) Received: from localhost.localdomain ([94.158.61.193]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aa32cbaaf2sm2782192e87.33.2026.05.25.08.13.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 May 2026 08:13:59 -0700 (PDT) From: Stepan Ionichev To: wbg@kernel.org Cc: patrick.havelange@essensium.com, peng.fan@nxp.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, andy@kernel.org, sozdayvek@gmail.com Subject: [PATCH v2] counter: ftm-quaddec: use devm_mutex_init() Date: Mon, 25 May 2026 20:12:40 +0500 Message-Id: <20260525151240.7258-1-sozdayvek@gmail.com> X-Mailer: git-send-email 2.33.0.windows.2 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" ftm_quaddec_probe() calls mutex_init() but neither the cleanup action nor a remove callback issues a matching mutex_destroy(), which leaks the lock debug state when CONFIG_DEBUG_MUTEXES is enabled. Switch to devm_mutex_init() so the mutex is torn down in the same devm scope it was set up in. Fixes: a3b9a99980d9 ("counter: add FlexTimer Module Quadrature decoder coun= ter driver") Signed-off-by: Stepan Ionichev Reviewed-by: Joshua Crofts --- v2: - Add Fixes tag and note that the leak only shows up under CONFIG_DEBUG_MUTEXES (William, applied from the interrupt-cnt thread) v1: https://lore.kernel.org/all/20260523184351.7567-1-sozdayvek@gmail.com/ drivers/counter/ftm-quaddec.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c index c47741292..8455f16d6 100644 --- a/drivers/counter/ftm-quaddec.c +++ b/drivers/counter/ftm-quaddec.c @@ -292,7 +292,9 @@ static int ftm_quaddec_probe(struct platform_device *pd= ev) counter->signals =3D ftm_quaddec_signals; counter->num_signals =3D ARRAY_SIZE(ftm_quaddec_signals); =20 - mutex_init(&ftm->ftm_quaddec_mutex); + ret =3D devm_mutex_init(&pdev->dev, &ftm->ftm_quaddec_mutex); + if (ret) + return ret; =20 ftm_quaddec_init(ftm); =20 --=20 2.43.0