linux-kernel - Re: [BUG] ide dma_timer

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Message-ID: <20070621224102.1ae04397@the-village.bc.nu>
Date:	Thu, 21 Jun 2007 22:41:02 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Linas Vepstas <linas@...tin.ibm.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Stuart_Hayes@...l.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup

> > queue ? You are overestimating IDE ;)
> 
>     He's not -- there is queued commands support since ATA[PI]-5. I'm not sure 
> why but Linux decided not to support it.

Almost no hardware supports it and the functionality is really really
ugly to use when it works at all - NCQ is rather more elegant.

Alan
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