linux-kernel - [PATCH 5.17 1062/1126] platform/x86: asus-wmi: Fix regression when probing for fan curve control

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Message-Id: <20220405070438.633178279@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:30:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Abhijeet V <abhijeetviswa@...il.com>
Subject: [PATCH 5.17 1062/1126] platform/x86: asus-wmi: Fix regression when probing for fan curve control

From: Hans de Goede <hdegoede@...hat.com>

commit d717e4509af0380a94dbc28b61839df39f17e1eb upstream.

The fan curve control patches introduced a regression for at least the
TUF FX506 and possibly other TUF series laptops that do not have support
for fan curve control.

As part of the probing process, asus_wmi_evaluate_method_buf is called
to get the factory default fan curve . The WMI management function
returns 0 on certain laptops to indicate lack of fan curve control
instead of ASUS_WMI_UNSUPPORTED_METHOD. This 0 is transformed to
-ENODATA which results in failure when probing.

Fixes: 0f0ac158d28f ("platform/x86: asus-wmi: Add support for custom fan curves")
Reported-and-tested-by: Abhijeet V <abhijeetviswa@...il.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Link: https://lore.kernel.org/r/20220205112840.33095-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/platform/x86/asus-wmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -2059,7 +2059,7 @@ static int fan_boost_mode_check_present(
 	err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_FAN_BOOST_MODE,
 				    &result);
 	if (err) {
-		if (err == -ENODEV)
+		if (err == -ENODEV || err == -ENODATA)
 			return 0;
 		else
 			return err;