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

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Message-ID: <20080625141242.GA27389@polina.dev.rtsoft.ru>
Date:	Wed, 25 Jun 2008 18:12:42 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

On Wed, Jun 25, 2008 at 01:32:57PM +0100, Alan Cox wrote:
> > 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 ?

There are lots of places that reads status register, and looking into
the code flow I don't see any problem with the code.

But to be sure I inserted a printk into INB, and I don't see any status
reads when/after the drive asserts its IRQ.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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