ACPI: fan: Initialize performance state sysfs attribute

The following warning is reported if lock debugging is enabled.

DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 1 at kernel/locking/lockdep.c:4617 lockdep_init_map_waits+0x141/0x222
...
Call Trace:
 __kernfs_create_file+0x7a/0xd8
 sysfs_add_file_mode_ns+0x135/0x189
 sysfs_create_file_ns+0x70/0xa0
 acpi_fan_probe+0x547/0x621
 platform_drv_probe+0x67/0x8b
 ...

Dynamically allocated sysfs attributes need to be initialized to avoid
the warning.

Fixes: d19e470b6605 ("ACPI: fan: Expose fan performance state information")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: 5.6+ <stable@vger.kernel.org> # 5.6+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 48354f8..66c3983 100644 (file)
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -352,6 +352,7 @@ static int acpi_fan_get_fps(struct acpi_device *device)
                struct acpi_fan_fps *fps = &fan->fps[i];
 
                snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
+               sysfs_attr_init(&fps->dev_attr.attr);
                fps->dev_attr.show = show_state;
                fps->dev_attr.store = NULL;
                fps->dev_attr.attr.name = fps->name;