netdev - Re: [PATCH] ehea: fix losing of NEQ events when one event occurred early

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Message-Id: <20120510.224603.1777168443514351915.davem@davemloft.net>
Date:	Thu, 10 May 2012 22:46:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	cascardo@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ehea: fix losing of NEQ events when one event occurred
 early

From: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Date: Thu, 10 May 2012 11:00:53 -0300

> The NEQ interrupt is only triggered when there was no previous pending
> interrupt. If we request irq handling after an interrupt has occurred,
> we will never get an interrupt until we call H_RESET_EVENTS.
> 
> Events seem to be cleared when we first register the NEQ. So, when we
> requested irq handling right after registering it, a possible race with
> an interrupt was much less likely. Now, there is a chance we may lose
> this race and never get any events.
> 
> The fix here is to poll and acknowledge any events that might have
> happened right after registering the irq handler.
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>

Applied.
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