linux-kernel - Re: [PATCH v2 0/3] ahci: fix boot/resume COMRESET failures

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Date:	Wed, 7 Mar 2012 13:28:12 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	cwillu <cwillu@...llu.com>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Norbert Preining <preining@...ic.at>,
	"Srivatsa S . Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Matt <jackdachef@...il.com>
Subject: Re: [PATCH v2 0/3] ahci: fix boot/resume COMRESET failures

On Mon, Mar 5, 2012 at 1:12 PM, cwillu <cwillu@...llu.com> wrote:
> On Sun, Mar 4, 2012 at 6:58 PM, Lin Ming <ming.m.lin@...el.com> wrote:
>> On Fri, Mar 2, 2012 at 9:16 PM, cwillu <cwillu@...llu.com> wrote:
>>> On Tue, Feb 21, 2012 at 12:38 PM, Brian Norris
>>> <computersforpeace@...il.com> wrote:
>>>> This series addresses regression problems with
>>>>
>>>>    commit 7faa33da9b7add01db9f1ad92c6a5d9145e940a7
>>>>    ahci: start engine only during soft/hard resets
>>>
>>> I just spent the better part of last night tracking down the specific
>>> sources of the log entry I get when I disconnect my e-sata drive; once
>>> it disconnects, the port is dead until I reboot; no combination of
>>> anything I've been able to poke at in /sys or elsewhere gets it live
>>> again.  This starts with 3.3rc1, and turns out to still work fine in
>>> 3.2.1. Any chance it's related?
>>>
>>> 3.3rc5, immediately after the unplug:
>>
>> Hi,
>>
>> I tested on my machine and it's fixed by below patch.
>> http://marc.info/?l=linux-kernel&m=132996405028746&w=2
>>
>> Would you please also try it?
>
> Building it now, and will be able to test in about 5 hours.

Hi,

How about the test result?

Regards,
Lin Ming

>
> After looking at the thread, I spent another couple hours on poking
> /sys, and did get the port to come back up and find the drive with the
> following:
>
> echo on > /sys/devices/pci0000:00/0000:00:1f.2/ata5/power/control
> echo on > /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/power/control
> echo '- - -' > /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/scsi_host/host4/scan
> --
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