hwmon: (gigabyte_waterforce) Mark status report as received under a spinlock

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: d5939a7 ("hwmon: Add driver for Gigabyte AORUS Waterforce AIO coolers")
Signed-off-by: Aleksa Savic <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: aleksamagicka

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;