netdev - Re: MSI interrupts and disable

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Message-ID: <47090F55.3020800@colorfullife.com>
Date:	Sun, 07 Oct 2007 18:54:45 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	Yinghai Lu <yhlu.kernel@...il.com>,
	Ayaz Abdulla <aabdulla@...dia.com>,
	nedev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: MSI interrupts and disable_irq

Jeff Garzik wrote:
>
> Interested parties should try the forcedeth patches I just posted :)
>
The patches look good, but I would still prefer to understand why the 
current implementation causes crashes before rewriting everything.

I've just noticed that netpoll_send_skb() calls ->hard_start_xmit() and 
->poll() within local_irq_save().
Thus it seems that  spin_lock_irqsave() must be used in the poll() and 
hard_start_xmit() callbacks, at least in nics that support 
POLL_CONTROLLER :-(

--
    Manfred

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