Messages in this thread | | | Subject | Re: Add support for checking before-the-fact whether an IRQ is | From | Arjan van de Ven <> | Date | Mon, 29 Dec 2003 20:18:28 +0100 |
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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() ???? [unhandled content-type:application/pgp-signature] | |