Date: Tue, 24 Jun 2008 03:52:54 +0400
From: Anton Vorontsov <avorontsov@ru.mvista.com>
To: linux-ide@vger.kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Ingo Molnar <mingo@elte.hu>,
       Sergei Shtylyov <sshtylyov@ru.mvista.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -rt] ide: fix interrupts processing issue with
	preempt-able hardirqs
Message-ID: <20080623235254.GA10728@polina.dev.rtsoft.ru>
Reply-To: avorontsov@ru.mvista.com
References: <20080623234037.GA6793@polina.dev.rtsoft.ru>
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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@gmail.com
irc://irc.freenode.net/bd2
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