linux-kernel - Re: [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs

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Date:	Wed, 25 Jun 2008 13:32:57 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	avorontsov@...mvista.com
Cc:	Ingo Molnar <mingo@...e.hu>, linux-ide@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [PATCH -rt] ide: fix interrupts processing issue with
 preempt-able hardirqs

> The bug, as I see it, in the alim15x3 (ULi M5228) hardware: for some
> reason it does not hold IRQ line, but rises it for some short period
> of time (while the drive itself rises and holds it correctly -- I'm
> seeing it via oscilloscope).

Are you sure the kernel isn't touching the status register and so
clearing the IRQ condition at the controller ?
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