linux-kernel - Re: [PATCH 3.12 46/62] irq: Enable all irqs unconditionally in irq

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Date:	Tue, 10 Dec 2013 13:52:53 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Laxman Dewangan <ldewangan@...dia.com>,
	ian.campbell@...rix.com, rjw@...ysocki.net, len.brown@...el.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3.12 46/62] irq: Enable all irqs unconditionally in irq_resume

Am Dienstag, 10. Dezember 2013, 10:08:47 schrieb Greg Kroah-Hartman:
> On Tue, Dec 10, 2013 at 10:01:13AM +0100, Pavel Machek wrote:
> > Hi!
> > 
> > > 3.12-stable review patch.  If anyone has any objections, please let
> > > 
> > >  me know.
> > 
> > Objections... well... I'm not sure if it meets stable criteria. In
> > particular, I don't think it was ever demonstrated as having bad
> > effect on the users.
> 
> Well, I'm guessing someone on the cc: here wanted it in stable@, so I'll
> let them speak up as to why...

As for bad effects on users ... any suspend_noirq callback returning an error 
and thus aborting the suspend will cause the error fixed by this, as the 
early-irqs won't get reenabled in the suspend-rollback [due to the syscore_ops 
doing their resume never being run].

You could for example lose keys connected thru the gpio-keys driver until the 
next reboot.

And it seems at least Laxman and myself were affected by it.


Heiko
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