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From: Mark Lord <liml@rtr.ca>
To: Tejun Heo <htejun@gmail.com>
Cc: Jeff Garzik <jeff@garzik.org>,
	IDE/ATA development list <linux-ide@vger.kernel.org>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	albertl@mail.com, diego torres <dtorres@coral.dnsalias.org>,
	Michael Tokarev <mjt@tls.msk.ru>
Subject: Re: [PATCH #upstream-fixes] libata: kill spurious NCQ completion detection
Date: Fri, 07 Dec 2007 18:24:11 -0500	[thread overview]
Message-ID: <4759D61B.8010802@rtr.ca> (raw)
In-Reply-To: <4758C20F.8020005@gmail.com>

Tejun Heo wrote:
> Spurious NCQ completion detection implemented in ahci was incorrect.
> On AHCI receving and processing FISes and raising interrupts are not
> interlocked and spurious interrupts are expected.
> 
> For example, if an interrupt occurs while interrupt handler is running
> and the running interrupt handler handles the event the new IRQ
> indicated, after IRQ handler finishes, it will be executed again
> because IRQ pending bit is set by the new interrupt but there won't be
> anything to process.
...

Great job tracking that one down, Tejun!

Cheers

      parent reply	other threads:[~2007-12-07 23:24 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-07  3:46 [PATCH #upstream-fixes] libata: kill spurious NCQ completion detection Tejun Heo
2007-12-07 20:29 ` Jeff Garzik
2007-12-07 23:24 ` Mark Lord [this message]

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