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

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Message-ID: <20170711161448.yqrhymmejxtnx7e7@earth>
Date:   Tue, 11 Jul 2017 18:14:48 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Tony Lindgren <tony@...mide.com>,
        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

Hi,

On Tue, Jul 11, 2017 at 08:40:10AM -0700, Linus Torvalds wrote:
> On Tue, Jul 11, 2017 at 7:41 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > Ah. Now that makes sense.
> >
> > Unpatched the ordering is:
> >
> >           chip_bus_lock(desc);
> >           irq_request_resources(desc);
> 
> I *looked* at that ordering and then went "Naah, that makes no sense".
> 
> But if that's the only issue, how about we just re-order those things
> - we still don't need to move the irq_request_resources() into the
> spinlock, we just move it to below the chip_bus_lock().
> 
> IOW, something like the (COMPLETELY UNTEESTED!) attached patch.

That patch on top of 9967468c0a10 fixes boot on Droid 4.

> This assumes that the chip_bus_lock() thing is still ok for the RT
> case, but it looks like it might be: the only other one I looked at
> (apart from the gpio-omap one) used a mutex.

-- Sebastian

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