The patch adds boundary check for the MAX_GSI_NUM.
Same as the update for i386, the patch addresses a problem with ACPI SCI IRQ.
The patch corrects the code such that SCI IRQ is skipped and duplicate entry is avoided.
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/x86_64/kernel/mpparse.c~irq-pack-x86_64-update arch/x86_64/kernel/mpparse.c
--- linux-2.6.13-rc2/arch/x86_64/kernel/mpparse.c~irq-pack-x86_64-update 2005-07-10 01:36:23.628899784 -0700
+++ linux-2.6.13-rc2-root/arch/x86_64/kernel/mpparse.c 2005-07-10 01:36:23.641897808 -0700
@@ -965,8 +965,21 @@ int mp_register_gsi(u32 gsi, int edge_le
* due to unused I/O APIC pins.
*/
int irq = gsi;
- gsi = pci_irq++;
- gsi_to_irq[irq] = gsi;
+ if (gsi < MAX_GSI_NUM) {
+ 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);
+ return gsi;
+ }
}
io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
_
-
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