From 9fe1bb29ea0ab231aa916dad4bcf0c435beb5869 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 27 Apr 2022 13:49:56 +0200
Subject: [PATCH] platform/x86: asus-wmi: Fix driver not binding when fan curve control probe fails
Git-commit: 9fe1bb29ea0ab231aa916dad4bcf0c435beb5869
Alt-commit: c5f2b8e9a9f891f67c58a3d9c6bca1eb8449dda2
Patch-mainline: v5.18-rc5
References: git-fixes
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@ljones.dev>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220427114956.332919-1-hdegoede@redhat.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 7e3c0a8e3997..0e7fbed8a50d 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;
--
2.31.1