linux-kernel - [PATCH AUTOSEL 5.6 014/149] platform/x86: asus_wmi: Fix return value of fan_boost_mode

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Date:   Sat, 11 Apr 2020 19:01:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Leonid Maksymchuk <leonmaxx@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>,
        acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 5.6 014/149] platform/x86: asus_wmi: Fix return value of fan_boost_mode_store

From: Leonid Maksymchuk <leonmaxx@...il.com>

[ Upstream commit edeee341fd6c1099de357c517af215bee2c6f766 ]

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>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 612ef55262268..e5d35987c048a 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
-- 
2.20.1