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([178.197.222.82]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3730813cdcfsm2069377f8f.29.2024.08.22.09.33.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Aug 2024 09:33:47 -0700 (PDT) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Neil Armstrong , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Krzysztof Kozlowski , stable@vger.kernel.org Subject: [PATCH 1/2] soc: qcom: pmic_glink: fix scope of __pmic_glink_lock in pmic_glink_rpmsg_probe() Date: Thu, 22 Aug 2024 18:33:44 +0200 Message-ID: <20240822163345.223787-1-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 File-scope "__pmic_glink_lock" mutex protects the filke-scope "__pmic_glink", thus reference to it should be obtained under the lock, just like pmic_glink_rpmsg_remove() is doing. Otherwise we have a race during if PMIC GLINK device removal: the pmic_glink_rpmsg_probe() function could store local reference before mutex in driver removal is acquired. Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver") Cc: Signed-off-by: Krzysztof Kozlowski --- drivers/soc/qcom/pmic_glink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c index 9606222993fd..452f30a9354d 100644 --- a/drivers/soc/qcom/pmic_glink.c +++ b/drivers/soc/qcom/pmic_glink.c @@ -217,10 +217,11 @@ static void pmic_glink_pdr_callback(int state, char *svc_path, void *priv) static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev) { - struct pmic_glink *pg = __pmic_glink; + struct pmic_glink *pg; int ret = 0; mutex_lock(&__pmic_glink_lock); + pg = __pmic_glink; if (!pg) { ret = dev_err_probe(&rpdev->dev, -ENODEV, "no pmic_glink device to attach to\n"); goto out_unlock;