linux-kernel - [PATCH] platform/x86: asus_wmi: Fix return value of fan_boost_mode

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Message-Id: <20200304113811.31988-1-leonmaxx@gmail.com>
Date:   Wed,  4 Mar 2020 13:38:11 +0200
From:   Leonid Maksymchuk <leonmaxx@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     corentin.chary@...il.com, dvhart@...radead.org, andy@...radead.org,
        yurii.pavlovskyi@...il.com, acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org,
        Leonid Maksymchuk <leonmaxx@...il.com>
Subject: [PATCH] platform/x86: asus_wmi: Fix return value of fan_boost_mode_store

Function fan_boost_mode_store returns 0 if store is successful,
this leads to infinite loop after any write to it's sysfs entry:

# echo 0 >/sys/devices/platform/asus-nb-wmi/fan_boost_mode

This command never ends, one CPU core is at 100% utilization.
This patch fixes this by returning size of written data.

Fixes: b096f626a682 ("platform/x86: asus-wmi: Switch fan boost mode")
Signed-off-by: Leonid Maksymchuk <leonmaxx@...il.com>
---
 drivers/platform/x86/asus-wmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 612ef5526226..e5d35987c048 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1719,7 +1719,7 @@ static ssize_t fan_boost_mode_store(struct device *dev,
 	asus->fan_boost_mode = new_mode;
 	fan_boost_mode_write(asus);
 
-	return result;
+	return count;
 }
 
 // Fan boost mode: 0 - normal, 1 - overboost, 2 - silent
-- 
2.25.1