[PATCH 0/2] platform/x86: asus-wmi: Serialize WMI evaluations and drop redundant rfkill lock

[Marco Scardovi <scardracs@disroot.org>]

ASUS WMI management methods share a single firmware/EC mailbox that is
not re-entrant. Concurrent evaluations from ACPI notify, sysfs, HID
callers (hid-asus, asus-armoury) and debugfs can trigger nested SMIs or
corrupt the mailbox.

This series serializes every ASUS_WMI_MGMT_GUID evaluation through a
global mutex, then drops the old per-device wmi_lock that only covered
WLAN rfkill hotplug.

The mutex is static because asus_wmi_evaluate_method() is exported and
callers outside asus-wmi have no struct asus_wmi. Fixes points at the
original shared evaluate helper rather than the later export, so stable
backports are not limited to kernels that carry that export.

Patch 1 introduces asus_wmi_evaluate_method_locked() and routes method3,
method5, method_buf and show_call through it.

Patch 2 removes the now-redundant wmi_lock and the pass-through
asus_rfkill_wlan_ops.

Link: https://github.com/OpenGamingCollective/asusctl/issues/328

Marco Scardovi (2):
  platform/x86: asus-wmi: Serialize WMI method evaluations with a mutex
  platform/x86: asus-wmi: Remove redundant per-device wmi_lock and
    duplicate rfkill ops

 drivers/platform/x86/asus-wmi.c | 67 +++++++++++----------------------
 1 file changed, 23 insertions(+), 44 deletions(-)

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2.55.0