linux-kernel - Re: [PATCH] ARM: sa1100: Initialize gpio after gpio subsystem has been initialized

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Date:	Fri, 1 Apr 2016 10:04:57 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: sa1100: Initialize gpio after gpio subsystem has
 been initialized

On Thu, Mar 31, 2016 at 6:21 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Tue, Mar 29, 2016 at 11:15:49AM -0700, Guenter Roeck wrote:
>> The sa1100 gpio driver was initialized from interrupt initialization code,
>> which is earlier than the gpio subsystem is initialized. Since commit
>> ff2b13592299 ("gpio: make the gpiochip a real device"), this is fatal
>> and causes the system to crash.
>>
>> The sa1100 gpio driver must be initialized prior to arch_initcall, since
>> its gpio pins are used in arch_initcall code, but after the gpio subsystem
>> is initialized (core_initcall). Initialize it with postcore_initcall.
>>
>> Fixes: ff2b13592299 ("gpio: make the gpiochip a real device")
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>
> Please ignore/drop this patch - a better (cleaner) fix is in the works
> for gpiolib.

This delivers though. I tested it on my also regressing iPAQ.

Yours,
Linus Walleij