Thanks ;)! I didn't find it. Kind regards
2014-08-26 15:39 GMT+02:00 <[email protected]>: > On Tue, 26 Aug 2014 08:33:18 +0200, Oscar Salvador said: > >> If I get the IRQ from the pci_dev, I get a X, but if I get the IRQ >> from the config space, I get another different number Y. >> >> Would be you so kind to explain: >> >> 1- Why it's better use the values stored in pci_dev structure instead >> of read from config space. >> 2- Why the IRQ number is different? (Maybe this question is answered >> with the first question hehe) > > The Linux kernel keeps track of both physical and logical IRQ numbers. > So physical IRQ 0 is often wired to a timer on x86 systems, but logical > IRQ 0 is used for NO_IRQ in dev->irq type usages. > > Screw it, I'll let Linus explain from a decade ago: > > http://yarchive.net/comp/linux/no_irq.html _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
