linux-kernel - [PATCH 2/5] leds: make sure leds_class is initialized before triggers are registered

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Message-Id: <1567946472-10075-3-git-send-email-akinobu.mita@gmail.com>
Date:   Sun,  8 Sep 2019 21:41:09 +0900
From:   Akinobu Mita <akinobu.mita@...il.com>
To:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Akinobu Mita <akinobu.mita@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>
Subject: [PATCH 2/5] leds: make sure leds_class is initialized before triggers are registered

If the led-class and usb-common modules are built into the kernel, the
usb-common module could be initialized earlier than the led-class module.

So when the ledtrig_usb_gadget and ledtrig_usb_host LED triggers are
registered by usb-common module, the leds_class could not be initialized
yet.

We are going to populate sub-directories, each representing an LED
trigger in /sys/class/triggers/, so leds_class needs to be initialized
before any LED triggers is registered.

This makes led-class initialize earlier then usb-common by changing
initcall group.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Dan Murphy <dmurphy@...com>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
 drivers/leds/led-class.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 8b5a1d1..7d85181 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -424,7 +424,7 @@ static void __exit leds_exit(void)
 	class_destroy(leds_class);
 }
 
-subsys_initcall(leds_init);
+postcore_initcall(leds_init);
 module_exit(leds_exit);
 
 MODULE_AUTHOR("John Lenz, Richard Purdie");
-- 
2.7.4