linux-kernel - Re: [GIT pull] irq updates for 4.13

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Message-ID: <alpine.DEB.2.20.1707111636180.1799@nanos>
Date:   Tue, 11 Jul 2017 16:41:01 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tony Lindgren <tony@...mide.com>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
        Linus Walleij <linus.walleij@...aro.org>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [GIT pull] irq updates for 4.13

On Tue, 11 Jul 2017, Tony Lindgren wrote:
> * Thomas Gleixner <tglx@...utronix.de> [170711 02:48]:
> And "external abort on non-linefetch" means something is not clocked
> in this case. The following alone makes things boot for me again, but I don't
> quite follow what has now changed with the ordering.. Thomas, any ideas?

Ah. Now that makes sense.

Unpatched the ordering is:

	  chip_bus_lock(desc);
	  irq_request_resources(desc);

Now the offending change reordered the calls. OMAP gpio has:

    omap_gpio_irq_bus_lock()
       pm_runtime_get_sync(bank->chip.parent);

So that at least explains the error. So that omap gpio irq chip (ab)uses
the bus_lock() callback to do runtime power management. Sigh, I did not
expect that. Let me have a deeper look if that's OMAP only or whether this
happens in other places as well.

Thanks,

	tglx