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platform/x86: asus-wmi: Fix driver not binding when fan curve control probe fails 

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: e3d13da7f7 ("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
This commit is contained in:
Hans de Goede 2022-04-27 13:49:56 +02:00
parent 4345ece8f0
commit 9fe1bb29ea
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/platform/x86/asus-wmi.c
View File

@ -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;