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| author | Natalie.Protasevich@unisys.com <Natalie.Protasevich@unisys.com> | 2005-07-30 11:25:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-30 13:37:50 -0700 |
| commit | 6a1caa21d66bcb9ba9892435a0a54fc32cd9eeab (patch) | |
| tree | 9e01b08b8aa2e40a80435570f3dab799f7909a35 /arch | |
| parent | c70f5d6610c601ea2ae4ae4e49f66c80801e895f (diff) | |
| download | lwn-6a1caa21d66bcb9ba9892435a0a54fc32cd9eeab.tar.gz lwn-6a1caa21d66bcb9ba9892435a0a54fc32cd9eeab.zip | |
[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')
| -rw-r--r-- | arch/x86_64/kernel/mpparse.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c index 08abf9f5b159..79c362d03e2e 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, |