The patch addresses a problem with ACPI SCI interrupt entry, which gets re-used, and the IRQ
is assigned to another unrelated device. The patch corrects the code such that SCI IRQ is
skipped and duplicate entry is avoided.
Second issue came up with VIA chipset, the problem was caused by original patch assigning IRQs
starting 16 and up. The VIA chipset uses 4-bit IRQ register for internal interrupt routing, and
therefore cannot handle IRQ numbers assigned to its devices. The patch corrects this problem
by allowing PCI IRQs below 16.
Signed-off by: Natalie Protasevich <[email protected]>
---
diff -puN arch/i386/kernel/mpparse.c~irq-pack-i386-update arch/i386/kernel/mpparse.c
--- linux-2.6.13-rc2/arch/i386/kernel/mpparse.c~irq-pack-i386-update 2005-07-10 01:36:42.428041880 -0700
+++ linux-2.6.13-rc2-root/arch/i386/kernel/mpparse.c 2005-07-10 03:56:44.567722496 -0700
@@ -1116,7 +1116,15 @@ int mp_register_gsi (u32 gsi, int edge_l
*/
int irq = gsi;
if (gsi < MAX_GSI_NUM) {
- gsi = pci_irq++;
+ if (gsi > 15)
+ gsi = pci_irq++;
+#ifdef CONFIG_ACPI_BUS
+ /*
+ * Don't assign IRQ used by ACPI SCI
+ */
+ if (gsi == acpi_fadt.sci_int)
+ gsi = pci_irq++;
+#endif
gsi_to_irq[irq] = gsi;
} else {
printk(KERN_ERR "GSI %u is too high\n", gsi);
_
-
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