netdev - Re: [PATCH] macmace: disable only the dma interrupt

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Date:	Sat, 10 Sep 2011 14:30:46 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fthain@...egraphics.com.au
Cc:	linux-m68k@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] macmace: disable only the dma interrupt

From: Finn Thain <fthain@...egraphics.com.au>
Date: Sun, 11 Sep 2011 01:02:16 +1000 (EST)

> Don't disable all interrupts, just disable the relevant one.
> 
> Also move a couple of printk calls outside of local_irq_save/restore.
> 
> Tested on a Quadra 660av.
> 
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>

Using disable_irq() is very expensive, and when done from an interrupt
handler can deadlock especially on SMP (which I understand might not
be relevant here).

I really can't see why you'd do things this way, especially since
interrupt handlers under Linux now unconditionally always run with cpu
interrupts disabled.
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