]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
pci, acpi: reroute PCI interrupt to legacy boot interrupt equivalent
authorStefan Assmann <sassmann@suse.de>
Wed, 11 Jun 2008 14:35:17 +0000 (16:35 +0200)
committerIngo Molnar <mingo@elte.hu>
Tue, 8 Jul 2008 15:50:53 +0000 (17:50 +0200)
commite1d3a90846b40ad3160bf4b648d36c6badad39ac
tree3c078d2b6046d90d1045efbcefe6a76a424a6f63
parent426b3b8d535e3e141331dc19c40f457b997c4d6d
pci, acpi: reroute PCI interrupt to legacy boot interrupt equivalent

Some chipsets (e.g. intel 6700PXH) generate a legacy INTx when the
IRQ entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel
does during interrupt handling). On chipsets where this INTx generation
cannot be disabled, we reroute the valid interrupts to their legacy
equivalent to get rid of spurious interrupts that might otherwise bring
down (vital) interrupt lines through spurious interrupt detection in
note_interrupt().

This patch benefited from discussions with Alexander Graf, Torsten Duwe,
Ihno Krumreich, Daniel Gollub, Hannes Reinecke. The conclusions we drew
and the patch itself are the authors' responsibility alone.

Signed-off-by: Stefan Assmann <sassmann@suse.de>
Signed-off-by: Olaf Dabrunz <od@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
drivers/acpi/pci_irq.c
drivers/pci/quirks.c
include/linux/pci.h