On Mon, Dec 5, 2016 at 7:59 AM, Guilherme G. Piccoli <gpiccoli@xxxxxxxxxxxxxxxxxx> wrote: > On PowerPC machines some PCI slots might not have level triggered > interrupts capability (also know as level signaled interrupts), > leading of_irq_parse_pci() to complain by presenting error messages > on the kernel log - in this case, the properties "interrupt-map" and > "interrupt-map-mask" are not present on device's node in the device > tree. > > This patch introduces a different message for this specific case, > and also reduces its level from error to warning. Besides, we warn > (once) that possibly some PCI slots on the system have no level > triggered interrupts available. > We changed some error return codes too on function of_irq_parse_raw() > in order other failure's cases can be presented in a more precise way. > > Before this patch, when an adapter was plugged in a slot without level > interrupts capabilitiy on PowerPC, we saw a generic error message > like this: > > [54.239] pci 002d:70:00.0: of_irq_parse_pci() failed with rc=-22 > > Now, with this applied, we see the following specific message: > > [16.154] pci 0014:60:00.1: of_irq_parse_pci: no interrupt-map found, > INTx interrupts not available > > Finally, we standardize the error path in of_irq_parse_raw() by always > taking the fail path instead of returning directly from the loop. > > Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxxxxxxxxxx> > --- > > v2: > * Changed function return code to always return negative values; Are you sure this is safe? This is tricky because of differing values of NO_IRQ (0 or -1). > * Improved/simplified warning outputs; > * Changed some return codes and some error paths in of_irq_parse_raw() > in order to be more precise/consistent; This too could have some side effects on callers. Not saying don't do these changes, just need some assurances this has been considered. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
