Re: Add support for checking before-the-fact whether an IRQ is

[Arjan van de Ven]

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@xxxxxxxxxxxxx
> 
> 	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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