linux-kernel - Re: [PATCH] uio: User IRQ Mode

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Message-ID: <20080702123158.2c4fefc6@lxorguk.ukuu.org.uk>
Date:	Wed, 2 Jul 2008 12:31:58 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc:	Magnus Damm <magnus.damm@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hjk@...utronix.de" <hjk@...utronix.de>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH] uio: User IRQ Mode

> Note that the irq is disabled instead of acked.  So this should not be a
> problem.  The userspace part then is responsible to ack (first) and
> unmask the irq.

That still doesn't make sense.

If you call disable_irq in the IRQ handler you will deadlock because it
waits until the IRQ handler has completed.
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