linux-kernel - Re: [PATCH] fix the interrupt loss problem on powerpc IPIC (2.6.23)

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Message-Id: <22854A2F-2FBD-4F1A-B623-DB5C91E97509@kernel.crashing.org>
Date:	Tue, 17 Feb 2009 08:43:03 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Li Yang <leoli@...escale.com>
Cc:	"<dayu@...angmobile.cn>" <dayu@...angmobile.cn>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] fix the interrupt loss problem on powerpc IPIC (2.6.23)


On Feb 17, 2009, at 8:38 AM, Li Yang wrote:

> On Tue, Feb 17, 2009 at 10:12 PM, Kumar Gala <galak@...nel.crashing.org 
> > wrote:
>>
>> On Feb 17, 2009, at 6:44 AM, <dayu@...angmobile.cn> <dayu@...angmobile.cn 
>> >
>> wrote:
>>
>>> From: Da Yu <dayu@...angmobile.cn>
>>> Date: Tue, 17 Feb 2009 19:58:20 +0800
>>> Subject: [PATCH] fix the interrupt loss problem on powerpc IPIC  
>>> (2.6.23)
>>>
>>> Signed-off-by: Da Yu <dayu@...angmobile.cn>
>>> ---
>>
>> Please provide a bit more description as to why this fixes the issue.
>
> The pending register is write 1 clear.  If there are more than one
> external interrupts pending at the same time, acking the first
> interrupt will also clear other interrupt pending bits.  That will
> cause loss of interrupt.
>
> - Leo

Thanks.  That should be included in the commit message.

- k
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