linux-kernel - Re: [patch] irq: do not mask interrupts by default

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Date:	Tue, 14 Nov 2006 09:20:23 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...l.org>,
	Komuro <komurojun-mbn@...ty.com>, tglx@...utronix.de,
	Adrian Bunk <bunk@...sta.de>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] irq: do not mask interrupts by default


> so my patch changes the default irq-disable logic of /all/ controllers
> to "delayed disable". (IRQ chips can still override this by providing a
> different chip->disable method that just clones their ->mask method, if
> it is absolutely sure that no IRQs can be lost while masked)
> 
> So this patch has the worst-case effect of getting at most one 'extra'
> interrupt after the IRQ line has been 'disabled' - at which point the
> line will be masked for real (by the flow handler). (I updated the
> fasteoi and the simple irq flow handlers to mask the IRQ for real if an
> IRQ triggers and the line was disabled.)

since disable_irq() is used as locking against interrupt context by
several drivers (*cough* ne2000 *cough*) I am not entirely convinced
this is a good idea....



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