From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <kernel@teksavvy.com>
Subject: Re: Hotplug borked after suspend/resume in Linux-3.3 ?
Date: Tue, 17 Apr 2012 21:46:50 -0400
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To: Lin Ming <ming.m.lin@intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>, Tejun Heo <htejun@gmail.com>, linux-ide@vger.kernel.org

On 12-04-17 09:37 PM, Mark Lord wrote:
> On 12-04-17 09:29 PM, Lin Ming wrote:
>>
>> I'm working on the hotplug issue fix.
>>
>> Before the fix is ready, here is the one-line patch.
>> Could you give it a try?
> ..
>> --- a/drivers/ata/libata-transport.c
>> +++ b/drivers/ata/libata-transport.c
>> @@ -294,6 +294,7 @@ int ata_tport_add(struct device *parent,
>>  	device_enable_async_suspend(dev);
>>  	pm_runtime_set_active(dev);
>>  	pm_runtime_enable(dev);
>> +	pm_runtime_forbid(dev);
>>  
> ..
> 
> I'm rebuilding the kernel right now.. should take about 5min or less to test.

Yeah, that (by itself) is enough to make things work again.
This looks like the one-liner that we really need upstream and in -stable.

Jeff?

I'll now use it instead of the (much larger) "v2 disable runtime pm" thing.