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

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Message-ID: <20080623235254.GA10728@polina.dev.rtsoft.ru>
Date:	Tue, 24 Jun 2008 03:52:54 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	linux-ide@...r.kernel.org
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -rt] ide: fix interrupts processing issue with
	preempt-able hardirqs

On Tue, Jun 24, 2008 at 03:40:37AM +0400, Anton Vorontsov wrote:
> IDE interrupt handler relies on the fact that, if necessary, hardirqs
> will re-trigger on ISR exit. With fully preemtable IRQs this seems to be
> not true, since if hardirq thread is currently running, and the same IRQ
> raised again, then this IRQ will be simply lost.

Btw, I don't actually understand why interrupt "simply lost", IMO it
should not.. :-/ But this what I'm observing via bunch of printks in
the code flow. Maybe there is not so obvious race, which I can't see.

So, help needed. Either it is a proper fix, or it is a workaround for
another bug somewhere else.

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