Subject: Re: MSI interrupts and disable_irq

From: Manfred Spraul <[email-masked]>
Date: Sun, 07 Oct 2007 18:54:45 +0200

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