linux-kernel - [PATCH 5.17 142/225] platform/x86: asus-wmi: Fix driver not binding when fan curve control probe fails

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Date:   Wed,  4 May 2022 18:46:20 +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, "Luke D. Jones" <luke@...nes.dev>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 142/225] platform/x86: asus-wmi: Fix driver not binding when fan curve control probe fails

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

[ Upstream commit 9fe1bb29ea0ab231aa916dad4bcf0c435beb5869 ]

Before this commit fan_curve_check_present() was trying to not cause
the probe to fail on devices without fan curve control by testing for
known error codes returned by asus_wmi_evaluate_method_buf().

Checking for ENODATA or ENODEV, with the latter being returned by this
function when an ACPI integer with a value of ASUS_WMI_UNSUPPORTED_METHOD
is returned. But for other ACPI integer returns this function just returns
them as is, including the ASUS_WMI_DSTS_UNKNOWN_BIT value of 2.

On the Asus U36SD ASUS_WMI_DSTS_UNKNOWN_BIT gets returned, leading to:

  asus-nb-wmi: probe of asus-nb-wmi failed with error 2

Instead of playing whack a mole with error codes here, simply treat all
errors as there not being any fan curves, fixing the driver no longer
loading on the Asus U36SD laptop.

Fixes: e3d13da7f77d ("platform/x86: asus-wmi: Fix regression when probing for fan curve control")
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2079125
Cc: Luke D. Jones <luke@...nes.dev>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Link: https://lore.kernel.org/r/20220427114956.332919-1-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/asus-wmi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 399a4a345224..1e7bc0c595c7 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -2227,9 +2227,10 @@ static int fan_curve_check_present(struct asus_wmi *asus, bool *available,
 
 	err = fan_curve_get_factory_default(asus, fan_dev);
 	if (err) {
-		if (err == -ENODEV || err == -ENODATA)
-			return 0;
-		return err;
+		pr_debug("fan_curve_get_factory_default(0x%08x) failed: %d\n",
+			 fan_dev, err);
+		/* Don't cause probe to fail on devices without fan-curves */
+		return 0;
 	}
 
 	*available = true;
-- 
2.35.1