linux-kernel - [PATCH 1/2] soc: qcom: pmic_glink: don't traverse clients list without a lock

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Message-Id: <20240402-pmic-glink-fix-clients-v1-1-885440b81c65@linaro.org>
Date: Tue, 02 Apr 2024 20:07:06 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH 1/2] soc: qcom: pmic_glink: don't traverse clients list
 without a lock

Take the client_lock before traversing the clients list at the
pmic_glink_state_notify_clients() function. This is required to keep the
list traversal safe from concurrent modification.

Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/soc/qcom/pmic_glink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c
index f913e9bd57ed..c999358771b3 100644
--- a/drivers/soc/qcom/pmic_glink.c
+++ b/drivers/soc/qcom/pmic_glink.c
@@ -168,8 +168,10 @@ static void pmic_glink_state_notify_clients(struct pmic_glink *pg)
 	}
 
 	if (new_state != pg->client_state) {
+		mutex_lock(&pg->client_lock);
 		list_for_each_entry(client, &pg->clients, node)
 			client->pdr_notify(client->priv, new_state);
+		mutex_unlock(&pg->client_lock);
 		pg->client_state = new_state;
 	}
 }

-- 
2.39.2