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x86: L-APIC: Set IRQ0 as edge-triggered

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IRQ0 is edge-triggered, but the "8259A Virtual Wire" through the local
APIC configuration in the 32-bit version uses the "fasteoi" handler
suitable for level-triggered APIC interrupt.  Rewrite code so that the
"edge" handler is used.  The 64-bit version uses different code and is
unaffected.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Maciej W. Rozycki 2008-07-11 19:34:36 +01:00 committed by Ingo Molnar
parent 392a0fc96b
commit 1baea6e2fe
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/io_apic_32.c
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@ -2052,7 +2052,7 @@ static struct irq_chip lapic_chip __read_mostly = {
.name = "local-APIC", .name = "local-APIC",
.mask = mask_lapic_irq, .mask = mask_lapic_irq,
.unmask = unmask_lapic_irq, .unmask = unmask_lapic_irq,
.eoi = ack_apic, .ack = ack_apic,
}; };
static void __init setup_nmi(void) static void __init setup_nmi(void)
@ -2257,8 +2257,8 @@ static inline void __init check_timer(void)
printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq, set_irq_chip_and_handler_name(0, &lapic_chip, handle_edge_irq,
"fasteoi"); "edge");
apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
enable_8259A_irq(0); enable_8259A_irq(0);