linux-kernel - [PATCH] ACPI: fan: Initialize performance state sysfs attribute

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Message-Id: <20201110235201.76981-1-linux@roeck-us.net>
Date:   Tue, 10 Nov 2020 15:52:01 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Zhang Rui <rui.zhang@...el.com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH] 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")
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/acpi/fan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 62873388b24f..9cbe58e394d0 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -351,6 +351,7 @@ 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;
-- 
2.17.1