linux-kernel - Re: Crashing 'kzm' target in next-20160913 due to 'gpio: mxc: shift gpio_mxc_init() to subsys

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Message-ID: <16c144a0-e967-e35a-2abd-9942d0d6c944@roeck-us.net>
Date:   Wed, 14 Sep 2016 07:33:43 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: Crashing 'kzm' target in next-20160913 due to 'gpio: mxc: shift
 gpio_mxc_init() to subsys_initcall level'

On 09/14/2016 12:19 AM, Linus Walleij wrote:
> On Wed, Sep 14, 2016 at 5:20 AM, Guenter Roeck <linux@...ck-us.net> wrote:
>
>> So, in other words, lots of bugs here. Nevertheless, I would suggest to keep
>> using postcore_initcall(), at least until it is sure that all gpio clients handle
>> -EPROBE_DEFER
>> correctly.
>
> So can I just revert this patch in isolation? None of the other patches
> depend on it?
>
Good question, if this was part of a series. If it was and can not be removed
in isolation, it nevertheless introduces a regression. Obviously there was
a reason for using postcore_initcall (which is quite evident in the crash),
and I don't think it is a good idea to just change it without addressing
the reason(s) first. Who knows what other platforms crash because of this
change.

Guenter