From: Mark Lord <liml@rtr.ca>
To: Jeff Garzik <jeff@garzik.org>
Cc: Tejun Heo <htejun@gmail.com>, Alan Cox <alan@redhat.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: libata fails to recover from HSM violation involving DRQ status
Date: Sat, 28 Apr 2007 17:35:00 -0400 [thread overview]
Message-ID: <4633BE04.2030201@rtr.ca> (raw)
In-Reply-To: <20070428222502.26fc9bbc@the-village.bc.nu>
Alan Cox wrote:
>> I am reluctant to do anything about this.
>
> This one does need dealing with. It happens in the real world and the old
> IDE paths for this do get triggered and used now and then (we know this
> because bugs in them were found). All it takes is a device and a
> controller disagreeing about the length of a data transfer to get in a
> mess. In theory resetting the bus should get you out of this, I'm
> suprised we didn't get out that way.
..
> SG_IO and other userspace interfaces can mean we issue a command that
> ends up causing variants of this kind of confusion.
That last one doesn't really worry me -- it has to be deliberately
done by the sysadmin.
But the history of real-world cases are definitely of concern,
especially since it's quite likely a rather simple fix.
I think failed WRITE_DMA requests (IDNF or ECC faults) were one source.
Cheers
next prev parent reply other threads:[~2007-04-28 21:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-28 20:15 libata fails to recover from HSM violation involving DRQ status Mark Lord
2007-04-28 20:18 ` Mark Lord
2007-04-28 20:30 ` Alan Cox
2007-04-28 20:37 ` Jeff Garzik
2007-04-28 20:44 ` Mark Lord
2007-04-28 20:50 ` Jeff Garzik
2007-04-28 21:25 ` Alan Cox
2007-04-28 21:35 ` Mark Lord [this message]
2007-04-28 21:38 ` Jeff Garzik
2007-04-28 21:41 ` Mark Lord
2007-04-29 3:17 ` Tejun Heo
2007-04-29 3:46 ` Jeff Garzik
2007-04-29 7:45 ` Tejun Heo
2007-04-29 3:51 ` Tejun Heo
2007-04-29 11:56 ` Mark Lord
2007-04-29 12:59 ` Mark Lord
2007-04-29 13:13 ` Mark Lord
2007-04-29 16:42 ` Tejun Heo
2007-04-29 16:47 ` Mark Lord
2007-04-29 18:49 ` Mark Lord
2007-04-29 19:05 ` Mark Lord
2007-04-30 0:59 ` Tejun Heo
2007-04-29 19:07 ` Mark Lord
2007-04-30 0:54 ` Tejun Heo
2007-04-30 3:42 ` Mark Lord
2007-04-30 3:58 ` Tejun Heo
2007-04-30 17:47 ` Mark Lord
2007-05-01 0:23 ` Mark Lord
2007-05-01 2:47 ` Tejun Heo
2007-05-01 13:00 ` Mark Lord
2007-05-11 3:33 ` Mark Lord
2007-05-11 3:35 ` Mark Lord
2007-04-29 12:07 ` Mark Lord
2007-04-29 16:36 ` Tejun Heo
2007-04-28 23:56 ` Alan Cox
2007-04-28 22:09 ` Mark Lord
2007-04-29 3:04 ` Tejun Heo
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