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Subject: Re: better leve triggered IRQ management needed
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
       linux-kernel@vger.kernel.org
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Date: Sat, 29 Apr 2006 22:25:11 +0100
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On Llu, 2006-04-24 at 11:41 -0700, Stephen Hemminger wrote:
> I am seeing repeated problems with misconfigured systems that have shared IRQ
> devices configured for edge-triggered.

I've been thinking about this a chunk more. The embedded folks have been
having a related argument about SA_EDGE and SA_LEVEL or similar. On some
embedded platforms the driver really has to pass this information
according to the board configuration.

Trying to guess the current IRQ level v edge on a PC is very hard.
Trying to set it correctly from the driver is rather easier.