netdev - Re: [PATCH] spidernet: fix interrupt reason recognition

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Date:	Thu, 13 Sep 2007 00:19:46 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ishizaki Kou <kou.ishizaki@...hiba.co.jp>
CC:	linas@...tin.ibm.com, netdev@...r.kernel.org,
	cbe-oss-dev@...abs.org
Subject: Re: [PATCH] spidernet: fix interrupt reason recognition

Ishizaki Kou wrote:
> This patch solves a problem that the spidernet driver sometimes fails
> to handle IRQ.
> 
> The problem happens because,
> - In Cell architecture, interrupts may arrive at an interrupt
>   controller, even if they are masked by the setting on registers of
>   devices. It happens when interrupt packets are sent just before 
>   the interrupts are masked.
> - spidernet interrupt handler compares interrupt reasons with
>   interrupt masks, so when such interrupts occurs, spidernet interrupt
>   handler returns IRQ_NONE.
> - When all of interrupt handler return IRQ_NONE, linux kernel disables
>   the IRQ and it no longer delivers interrupts to the interrupt handlers.
> 
> spidernet doesn't work after above sequence, because it can't receive
> interrupts.
>  
> This patch changes spidernet interrupt handler that it compares
> interrupt reason with SPIDER_NET_INTX_MASK_VALUE.
> 
> Signed-off-by: Kou Ishizaki <kou.ishizaki@...hiba.co.jp>

applied


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