linux-kernel - Re: acpi-test tree on eeepc: EC error message on second resume

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Date:	Sun, 12 Oct 2008 10:13:52 +0100
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Alexey Starikovskiy <aystarik@...il.com>,
	linux acpi <linux-acpi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: acpi-test tree on eeepc: EC error message on second resume

Rafael J. Wysocki wrote:
> On Saturday, 11 of October 2008, Alexey Starikovskiy wrote:
>   
>> Rafael J. Wysocki wrote:
>>     
>>>> No, we discussed this before -- we are outside of the transaction, thus 
>>>> no GPE
>>>> activity could interfere with ec_check_ibf0.
>>>>         
>>> Ok, this is in the process context and we don't really expect to get an
>>> interrupt at this point, but what happens if the EC generates an event that's
>>> not related to any transiaction.  Is that guaranteed to never happen?
>>>       
>> Interrupt handler in this case can't cause a change to status register, thus our 
>> read of it will not be affected by interrupt.
>>     
>
> Ok, thanks.
>
> Alan, does the patch work for you?
>
> Rafael
>   

Yes.  Two reboot cycles, three suspend/resume cycles each, and no error
message.

I hope we have a better fix in mind though :-P.  The patch doesn't solve
the unnecessary 500ms delay when this thing happens.

Thanks
Alan
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