linux-kernel - Re: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever

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Date:	Mon, 26 Nov 2007 14:45:32 +0100
From:	"Remy Bohmer" <linux@...mer.net>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"ARM Linux Mailing List" <linux-arm-kernel@...ts.arm.linux.org.uk>,
	RT <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever

Attached the same patch, but it also cleans the manage.c code a bit,
because the IRQ types 'simple IRQ', 'level-IRQ' and 'FastEOI' were
handled differently while they should be handled the same.

Kind Regards,

Remy

2007/11/26, Remy Bohmer <linux@...mer.net>:
> Hello,
>
> I use 2.6.23.1-rt5 on the Atmel AT91 series.
> Interrupt threading on Preempt-RT and ARM works fine, except for
> (edge-triggered) GPIO interrupts. There is a problem when a new
> interrupt arives while the interrupt thread is handling the previous
> interrupt. If this occurs the interrupt handling stalls forever.
>
> This is caused by a unbalanced interrupt mask/unmask problem in the kernel.
> The attached patch fixes this. More information about this problem is
> documented inside the patch itself.
>
> This patch is meant for Preempt-RT only.
>
> Kind Regards,
>
> Remy Bohmer
>
>

View attachment "fix-gpio-irq-stalling-bug.patch" of type "text/x-patch" (3100 bytes)