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Date: Tue, 11 Jul 2017 15:27:27 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
cc: Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Tony Lindgren <tony@atomide.com>, Pavel Machek <pavel@ucw.cz>,
        Marc Zyngier <marc.zyngier@arm.com>
Subject: Re: [GIT pull] irq updates for 4.13
In-Reply-To: <20170711112125.icbezbb722oymzwv@earth>
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References: <alpine.DEB.2.20.1707091044210.2493@nanos> <20170710133505.eo6w73kq2327n34p@earth> <CA+55aFz5=ubNvhTUTzk3kFuLMFToP7xh7h8NDXDor9w+cjsCBA@mail.gmail.com> <alpine.DEB.2.20.1707110815440.1799@nanos> <20170711092639.jmfg775bf2k7vwen@earth>
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On Tue, 11 Jul 2017, Sebastian Reichel wrote:
> On Tue, Jul 11, 2017 at 12:52:17PM +0200, Thomas Gleixner wrote:
> > On Tue, 11 Jul 2017, Thomas Gleixner wrote:
> > > On Tue, 11 Jul 2017, Sebastian Reichel wrote:
> > > So this crashes in do_raw_spin_unlock_irqrestore() !?! I just have to
> > > wonder how the raw_spin_lock() succeeded. That does not make any sense.
> > 
> > can you please apply the patch below on top of 4.12? It's a backport
> > isolating the resource request changes.
> 
> Full bootlog for v4.12 + your patch is below. I used the same
> .config with oldconfig.
> [    1.329315] cpcap-core spi1.0: CPCAP vendor: ST rev: 2.10 (1a)
> [    1.336914] Unhandled fault: imprecise external abort (0x1406) at 0x00000000
> [    1.343994] pgd = c0004000
> [    1.346710] [00000000] *pgd=00000000
> [    1.350341] Internal error: : 1406 [#1] SMP ARM
> [    1.354888] Modules linked in:
> [    1.357971] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-00001-g2a481f732c4b #1539
> [    1.365936] Hardware name: Generic OMAP4 (Flattened Device Tree)
> [    1.371978] task: ee8aadc0 task.stack: ee8ac000
> [    1.376556] PC is at lock_release+0x25c/0x360
> [    1.380950] LR is at lock_release+0x25c/0x360

Slightly different function, but in the same way non sensical.

I used your config with the extra bits for beaglebone XM enabled and it
just works. The irq_request_resources() callback is invoked and ends up in
omap_gpio_get_direction() without any complaints.

I'm running out of ideas right now.

Thanks,

	tglx