From: Tejun Heo <htejun@gmail.com>
To: Robert Hancock <hancockrwd@gmail.com>
Cc: Mark Lord <kernel@teksavvy.com>, Seed <seedrubbish@gmail.com>,
Jeff Garzik <jgarzik@pobox.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: [BUG] libahci returns stale result tf much of the time.
Date: Mon, 04 Oct 2010 11:18:03 +0200 [thread overview]
Message-ID: <4CA99BCB.8080904@gmail.com> (raw)
In-Reply-To: <4C9D33C0.8050900@gmail.com>
Hello,
On 09/25/2010 01:26 AM, Robert Hancock wrote:
>> And here's an example of the bug, which should work (as a demo)
>> for most folks out there with the same controller ahci / JMB360:
>>
>> Here, I'll use hdparm to do a "set acoustic" command
>> on a drive which does NOT have the "Acoustic Management" feature set.
>> Just look for the fd fd fd strings in the returned data,
>> and notice how the final IDENTIFY at the end works, but returns
>> bad ATA status 0x51 from the stale result_tf:
>
> The d2h_fis area is supposed to be updated by the controller with
> the last FIS received from the device. Maybe this controller just
> isn't doing that for some reason?
Hmm... one possibility is that the controller takes some time to
update the area and the driver is reading it off too early. Maybe
adding a delay would resolve the issue? Mark, do you know whether
this problem is isolated to JMB360?
Thanks.
--
tejun
next prev parent reply other threads:[~2010-10-04 9:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-24 5:34 [BUG] libahci returns stale result tf much of the time Mark Lord
2010-09-24 5:49 ` Seed
2010-09-24 6:27 ` Mark Lord
2010-09-24 7:01 ` Seed
2010-09-24 13:11 ` Mark Lord
2010-09-24 13:24 ` Mark Lord
2010-09-24 23:26 ` Robert Hancock
2010-10-04 9:18 ` Tejun Heo [this message]
2010-10-04 17:01 ` Mark Lord
2010-10-04 17:06 ` Mark Lord
2010-10-04 17:31 ` Mark Lord
2010-10-04 18:50 ` Mark Lord
2010-10-04 19:27 ` Jeff Garzik
2010-10-04 19:35 ` Mark Lord
2010-10-04 19:42 ` Jeff Garzik
2010-10-04 19:51 ` Mark Lord
2010-10-05 7:07 ` Tejun Heo
2010-10-05 14:06 ` Mark Lord
2010-10-05 16:06 ` Tejun Heo
2010-10-06 1:00 ` Robert Hancock
2010-10-14 8:53 ` [PATCH #upstream-fixes] libahci: fix result_tf handling after an ATA PIO data-in command Tejun Heo
2010-10-14 21:38 ` Mark Lord
2010-10-15 0:24 ` Robert Hancock
2010-10-15 8:45 ` Tejun Heo
2010-10-15 22:14 ` Mark Lord
2010-10-15 0:32 ` Robert Hancock
2010-10-15 8:45 ` Tejun Heo
2010-10-15 9:00 ` [PATCH UPDATED " Tejun Heo
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