Re: Hotplug borked after suspend/resume in Linux-3.3 ?

[Mark Lord <kernel@teksavvy.com>]

On 12-04-17 04:53 PM, Mark Lord wrote:
> On 12-04-17 04:48 PM, Mark Lord wrote:
>> On 12-04-17 04:38 PM, Mark Lord wrote:
>>> Okay, so why isn't SATA hotplug working in linux-3.3.2 ?
>>> I don't know when it stopped working, but it's a blooming pain in the sysadmin.
>>>
>>> I need to hotplug a SATA drive into an AHCI port,
>>> preferably without having to reboot first.
>>>
>>> Is there a patch available already for this regression?
>>
>>
>> Answering my own question, this patch appears to address the issue.
>> I'll test and report back again shortly:
>>
>>     http://patchwork.ozlabs.org/patch/146326/
>>
>> Odd that it's been sitting in various people's inboxes since 3.3-rc1
>> and hasn't been pushed out yet.
> 
> Ahh.. perhaps because it doesn't fix the problem I'm seeing here.
> 
> Oh well, anyone else got a fix for this regression yet?
> Even doing a rescan-scsi-bus doesn't work on the closed down ports.
> 
> Basically, any unoccupied AHCI port is dead to the world
> after a simple suspend/resume (RAM) cycle.  On one of my machines
> I can hot unplug/replug the ExpressCard adapter to recover,
> but that doesn't work so well for built-in SATA/eSATA ports.


Mmm.. on my little Atom ZBOX systems, the patch linked above
"Patchwork [v2] libata: disable runtime pm for hotpluggable port"
_does_ appear to fix the issue.

Maybe my notebook is suffering from the ExpressCard not being resumed properly,
which would be a PCI issue most likely.

Anyway, one issue at a time:  The "disable runtime pm" patch seems to
be the regression fix I'm looking for here so that I can use SATA hotplug
after a suspend/resume.

Why isn't this upstream as a regression fix yet?

Thanks