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(cable-178-148-234-71.dynamic.sbb.rs. [178.148.234.71]) by smtp.gmail.com with ESMTPSA id m5-20020a05600c4f4500b0040c57e4ea28sm3189788wmq.17.2023.12.19.06.41.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Dec 2023 06:41:17 -0800 (PST) From: Aleksa Savic To: linux-hwmon@vger.kernel.org Cc: Aleksa Savic , Jean Delvare , Guenter Roeck , linux-kernel@vger.kernel.org Subject: [PATCH] hwmon: (gigabyte_waterforce) Mark status report as received under a spinlock Date: Tue, 19 Dec 2023 15:36:19 +0100 Message-ID: <20231219143620.22179-1-savicaleksa83@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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785721918549548928 X-GMAIL-MSGID: 1785721918549548928 Through hidraw, userspace can cause a status report to be sent from the device. The parsing in waterforce_raw_event() may happen in parallel to a waterforce_get_status() call (which resets the completion for tracking the report) if it's running on a different CPU where bottom half interrupts are not disabled. Add a spinlock around the complete_all() call in waterforce_raw_event() to prevent race issues. Fixes: d5939a793693 ("hwmon: Add driver for Gigabyte AORUS Waterforce AIO coolers") Signed-off-by: Aleksa Savic --- Does the above make sense? The raw event parsing is a softirq AFAIK and presumably could run on a different CPU in parallel to a waterforce_get_status() call. Appreciate thoughts on this. --- drivers/hwmon/gigabyte_waterforce.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hwmon/gigabyte_waterforce.c b/drivers/hwmon/gigabyte_waterforce.c index 1799377fc2f1..85e523775714 100644 --- a/drivers/hwmon/gigabyte_waterforce.c +++ b/drivers/hwmon/gigabyte_waterforce.c @@ -276,8 +276,10 @@ static int waterforce_raw_event(struct hid_device *hdev, struct hid_report *repo priv->duty_input[0] = data[WATERFORCE_FAN_DUTY]; priv->duty_input[1] = data[WATERFORCE_PUMP_DUTY]; + spin_lock(&priv->status_report_request_lock); if (!completion_done(&priv->status_report_received)) complete_all(&priv->status_report_received); + spin_unlock(&priv->status_report_request_lock); priv->updated = jiffies;