linux-kernel - Re: pcim_enable_device BUGs for libata devices in 2.6.20-git6

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Date:	Tue, 13 Feb 2007 07:30:03 -0800
From:	Tejun Heo <htejun@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: pcim_enable_device BUGs for libata devices in 2.6.20-git6

Hello, Pavel.

Pavel Machek wrote:
>> 1. Don't restore power state and re-enable PCI device on resume from 
>> freeze just as we don't do the opposite when freezing.
>>
>> 2. Unconditionally disable and power down PCI device on suspend whether 
>> it's freeze or not.
>>
>> #2 would be simpler but I'm a bit worried about it.  There might be 
>> controllers which choke after such sequence (save state, disable, power 
>> down, no actual power removal, power on, restore state, re-enable).
> 
> I'd just go for #2.

I think I've been seeing too many weird ATA controller issues to be bold 
about this.  I'll chicken out and go for #1.  :-)

>> #1 can be easily done by taking a look at the current device power state 
>> (gendev->power.power_state).  The problem is that no one in 
>> suspend/resume path seems to be setting that variable except for
>> runtime 
> 
> No, that variable is probably going to go away. If you want to
> remember that you are resuming from freeze, just store that info in
> private data structure.

I see.  Thanks.

-- 
tejun
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