Re: PCI interrupts

[Tommy Reynolds]

--=._uw3o/W.pWi74r
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

It was a dark and stormy night.  Suddenly "Matthew Clark" <[e-mail]> wrote:

> In my development system the PCI card I am developing  the
> driver for reports (from the PCI config region) that it is using
> interrupt 5.  I can't register this interrupt as it is already
> in use by the USB controller.

PCI interrupts can be shared, but every handler must be registered with the
SA_SHIRQ flag on the request_irq() call.  Both the request_irq() and free_irq()
routines need a "dev_id" cookie to uniquely identify your instance of the
interrurpt handler.

You can see shared interrupts in "/proc/interrupts" because there will be a
comma-separated list of handler names for each IRQ level.

---------------------------------------------+-----------------------------
Tommy Reynolds                               | mailto: <[e-mail]>
Red Hat, Inc., Embedded Development Services | Phone:  [phone]
307 Wynn Drive NW, Huntsville, AL 35805 USA  | FAX:    [phone]
Senior Software Developer                    | Mobile: [phone]

--=._uw3o/W.pWi74r
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)

iEYEARECAAYFAjvn9cIACgkQWEn3bOOMcuoYFwCfQlwTBPW6BG9XTSISdA+pqMnD
FUgAnj4TGhaeRzaNQ7PMXJsSNZrjHHMK
=V9lM
-----END PGP SIGNATURE-----

--=._uw3o/W.pWi74r--