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From: Thomas Gleixner <tglx@linutronix.de>
To: Lukas Erlinghagen <lukas.erlinghagen@x2e.de>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: Kernel panic with PREEMPT_RT_FULL and UIO driver
Date: Wed, 21 Dec 2011 12:38:45 +0100 (CET)	[thread overview]
Message-ID: <alpine.LFD.2.02.1112211237100.3020@ionos> (raw)
In-Reply-To: <4EF1B984.4010102@x2e.de>

On Wed, 21 Dec 2011, Lukas Erlinghagen wrote:

> Dear list,
> 
> we're getting the kernel panic postet below on our system (Kernel version is
> 3.0.3-rt11, the platform is an embedded PowerPC 440 in a Virtex 5 FPGA, the
> device controlled by the UIO driver is a Freescale MFR4310 controller, and the
> interrupt is triggered by a high-active interrupt pin). This panic only occurs
> when using CONFIG_PREEMPT_RT_FULL, and only under high interrupt load on the
> MFR.
>
> I've also included our IRQ handler (registered with IRQF_ONESHOT) and IRQ
> control function.
> 
> Is there something fundamentally wrong we're doing, and if so, where can I

You are running the UIO interrupt handler with IRQF_NO_THREAD. That
can't work on RT.

Thanks,

	tglx



  reply	other threads:[~2011-12-21 11:38 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-21 10:48 Kernel panic with PREEMPT_RT_FULL and UIO driver Lukas Erlinghagen
2011-12-21 11:38 ` Thomas Gleixner [this message]
2011-12-22 10:31 ` Uwe Kleine-König
2011-12-22 12:58   ` Thomas Gleixner

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