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authorEric W. Biederman <ebiederm@xmission.com>2006-11-14 10:52:12 -0700
committerLinus Torvalds <torvalds@woody.osdl.org>2006-11-15 09:04:32 -0800
commit45c99533252ef2297f37c5fdd672a3e0eb566870 (patch)
tree469e706b7a6be19004015e305bdaf4cba4a89a52 /arch/x86_64/kernel/io_apic.c
parent134a11f0c37c043d3ea557ea15b95b084e3cc2c8 (diff)
[PATCH] Use delayed disable mode of ioapic edge triggered interrupts
Komuro reports that ISA interrupts do not work after a disable_irq(), causing some PCMCIA drivers to not work, with messages like eth0: Asix AX88190: io 0x300, irq 3, hw_addr xx:xx:xx:xx:xx:xx eth0: found link beat eth0: autonegotiation complete: 100baseT-FD selected eth0: interrupt(s) dropped! eth0: interrupt(s) dropped! eth0: interrupt(s) dropped! ... Linus Torvalds <torvalds@osdl.org> said: "Now, edge-triggered interrupts are a _lot_ harder to mask, because the Intel APIC is an unbelievable piece of sh*t, and has the edge-detect logic _before_ the mask logic, so if a edge happens _while_ the device is masked, you'll never ever see the edge ever again (unmasking will not cause a new edge, so you simply lost the interrupt). So when you "mask" an edge-triggered IRQ, you can't really mask it at all, because if you did that, you'd lose it forever if the IRQ comes in while you masked it. Instead, we're supposed to leave it active, and set a flag, and IF the IRQ comes in, we just remember it, and mask it at that point instead, and then on unmasking, we have to replay it by sending a self-IPI." This trivial patch solves the problem. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@redhat.com> Acked-by: Komuro <komurojun-mbn@nifty.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/io_apic.c')
-rw-r--r--arch/x86_64/kernel/io_apic.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 41bfc49301a..14654e68241 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -790,9 +790,11 @@ static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
trigger == IOAPIC_LEVEL)
set_irq_chip_and_handler_name(irq, &ioapic_chip,
handle_fasteoi_irq, "fasteoi");
- else
+ else {
+ irq_desc[irq].status |= IRQ_DELAYED_DISABLE;
set_irq_chip_and_handler_name(irq, &ioapic_chip,
handle_edge_irq, "edge");
+ }
}
static void __init setup_IO_APIC_irqs(void)