linux-kernel - Re: Bug in 2.6.29 ide-cd: Kernel freeze: bisected + unacceptable workaround

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Message-ID: <49D20E1B.7010104@nessie.de>
Date:	Tue, 31 Mar 2009 14:35:39 +0200
From:	Michael Roth <mroth@...sie.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	petkovbb@...il.com, petkovbb@...glemail.com,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Bug in 2.6.29 ide-cd: Kernel freeze: bisected + unacceptable
 workaround

>> take it ok. Also, if I remember correctly, the original ide-cd behavior
>> was to issue the command and _then_ start DMA so we're back to that. I
>> guess now we should be concerned whether the other ATAPI devices can
>> handle the reverse situation where you first issue a command and _then_
>> start DMA.. Hmm...
> 
> Most devices don't care but you do need to follow the exact ATAPI spec.
> If you search way back through the archives you'll find long discussions
> on this during either 2.4 or 2.2 when HP hit problems caused by us
> turning DMA on too early.

AFAIK, the old bevavior was to start DMA _after_ issuing the command _only_
for CD-drives and for the remaining ide devices the other way around,
why not just restore the old behavior and do the DMA after command only
for CD-drives?


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