From: Arjan van de Ven <arjanv@redhat.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: torvalds@osdl.org
Subject: Re: Add support for checking before-the-fact whether an IRQ is
Date: Mon, 29 Dec 2003 20:18:28 +0100 [thread overview]
Message-ID: <1072725508.4233.11.camel@laptop.fenrus.com> (raw)
In-Reply-To: <200312291905.hBTJ56k1032326@hera.kernel.org>
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On Mon, 2003-12-29 at 19:18, Linux Kernel Mailing List wrote:
> ChangeSet 1.1552, 2003/12/29 10:18:11-08:00, torvalds@home.osdl.org
>
> Add support for checking before-the-fact whether an IRQ is
> already registered or not. The x86 PCI layer wants this for
> its availability testing.
>
> Doing a request_irq()/free_irq() pair to check this condition
> like we used to do can lock the machine if the irq happens to
> be screaming.
question; which lock prevents someone else claiming the irq and making
it unsharable/unclaimable between can_request_irq() and the eventual
request_irq() ????
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next parent reply other threads:[~2003-12-29 19:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200312291905.hBTJ56k1032326@hera.kernel.org>
2003-12-29 19:18 ` Arjan van de Ven [this message]
2003-12-29 19:43 ` Linus Torvalds
2003-12-30 2:47 ` Rusty Russell
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