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authorNatalie.Protasevich@unisys.com <Natalie.Protasevich@unisys.com>2005-07-30 11:25:32 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-30 13:37:50 -0700
commit6a1caa21d66bcb9ba9892435a0a54fc32cd9eeab (patch)
tree9e01b08b8aa2e40a80435570f3dab799f7909a35 /arch/x86_64
parentc70f5d6610c601ea2ae4ae4e49f66c80801e895f (diff)
[PATCH] x86_64: avoid wasting IRQs patch update
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 <Natalie.Protasevich@unisys.com> Acked-by: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/mpparse.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 08abf9f5b15..79c362d03e2 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -970,8 +970,21 @@ int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
* 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,