linux-kernel - Re: [git patch] free

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Date:	Tue, 22 Apr 2008 18:59:49 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, rmk@....linux.org.uk
Subject: Re: [git patch] free_irq() fixes

Linus Torvalds wrote:
> Quite frankly, I'd actually prefer to just reinstate "dev" to the irq 
> registration instead.
> 
> Why? Because that field is how we are able to track multiple interrupt 
> registrations that share an IRQ. Now, the "request_irq()" logic has a 
> special rule that actually tests that NULL is a valid cookie if the 
> IRQF_SHARED bit isn't set, but isn't it a nice thing to double-check 
> regardless?
[...]
> This, in contrast, *really* sucks as a cookie. In fact, it's useless. If 
> there are multiple tp3780i instances on the same irq, they will always 
> have the same cookie.

AFAICS that will never happen for mwave hardware.

Nonetheless, it's a good point that NULL fails for disambiguation, so I 
created the attached, which should do what you want.  I'll push it after 
the compiler gives it a green light (unless it needs further revisions)

(note, for mwave I couldn't use pSettings, since that might fail the 
ambiguity test)

	Jeff




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