linux-kernel - Re: [PATCH -rt] serial: 8250: fix shared interrupts issues under RT kernels

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Date:	Tue, 24 Jun 2008 02:12:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	linux-serial@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH -rt] serial: 8250: fix shared interrupts issues under
	RT kernels


* Anton Vorontsov <avorontsov@...mvista.com> wrote:

> 8250's initialization routines relies on the fact that _irqsave 
> spinlock will disable local hardirqs, so that the driver can issue 
> IRQ-triggering operations before registering the port in the IRQ 
> chain.
> 
> With RT kernels and preemptable hardirqs this isn't true, _irqsave 
> spinlock does not disable local hardirqs, and this causes following 
> trace:

again, please let the -rt maintainers sort out which patches need to be 
propagated to upstream maintainers.

	Ingo
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