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[PATCH] x86_64: avoid wasting IRQs patch update

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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>
This commit is contained in:
Natalie.Protasevich@unisys.com 2005-07-30 11:25:32 -07:00 committed by Linus Torvalds
parent c70f5d6610
commit 6a1caa21d6
1 changed files with 15 additions and 2 deletions
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17
arch/x86_64/kernel/mpparse.c
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@ -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,