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

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Message-ID: <2a27d3730902170638h43724c03k6b50843158842e1e@mail.gmail.com>
Date:	Tue, 17 Feb 2009 22:38:18 +0800
From:	Li Yang <leoli@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
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 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
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