From: Mark Lord <kernel@teksavvy.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Tejun Heo <htejun@gmail.com>,
Robert Hancock <hancockrwd@gmail.com>,
Seed <seedrubbish@gmail.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 15:51:15 -0400 [thread overview]
Message-ID: <4CAA3033.8030405@teksavvy.com> (raw)
In-Reply-To: <4CAA2E16.4010905@pobox.com>
On 10-10-04 03:42 PM, Jeff Garzik wrote:
> On 10/04/2010 03:35 PM, Mark Lord wrote:
>> Yeah. Non-data commands still get a (correct) updated result_tf from AHCI,
>> but data commands don't get one, unless they fail.
>>
>> Weird, but I've worked around it now.
>
> Might be that we just get a single-bit "OK" notification from hardware for successfully completed commands, a la NCQ's SDB FIS.
>
> Which opcodes are you using? I see set-acoustic-mgmt in one email...
opcode 0xec : IDENTIFY
The result_tf it receives is from whatever non-data command last preceeds it.
So if the previous non-data command failed (eg. hdparm -Z),
then the IDENTIFY command actually works, but appears to fail.
Cheers
next prev parent reply other threads:[~2010-10-04 19:51 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
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 [this message]
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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