diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2007-12-20 15:10:02 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-12-20 16:18:17 +1100 |
| commit | 54a24cbbd0184faffc37c39cd3a896f4ddac3e03 (patch) | |
| tree | 4ff7a745643406883ba87ee4aa4f527040c6bf71 /arch/powerpc/kernel/pci-common.c | |
| parent | 553aa7659bc0e188348f64e978343ed984eb6e56 (diff) | |
[POWERPC] Fix PCI IRQ fallback code to not map IRQ 0
The PCI IRQ code has a fallback when the device-tree parsing fails, that
tries to map the interrupt indicated by PCI_INTERRUPT_LINE if the firmware
set something in there. This is a bit fragile but has proven useful in some
cases so far. However, it's causing us to incorrectly try to map interrupt 0
on various setups, so let's prevent that case, as none of the cases where
the fallback is legit should have an IRQ 0.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/pci-common.c')
| -rw-r--r-- | arch/powerpc/kernel/pci-common.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 88838b0f8b90..571854f2906c 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -225,10 +225,11 @@ int pci_read_irq_line(struct pci_dev *pci_dev) if (pin == 0) return -1; if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || - line == 0xff) { + line == 0xff || line == 0) { return -1; } - DBG(" -> no map ! Using irq line %d from PCI config\n", line); + DBG(" -> no map ! Using line %d (pin %d) from PCI config\n", + line, pin); virq = irq_create_mapping(NULL, line); if (virq != NO_IRQ) |