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Fix very high interrupt rate for IRQ8 (rtc) unless pnpacpi=off

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Workaround for broken systems with BIOS that makes RTC interrupt level
triggered and/or active low.

See http://bugzilla.kernel.org/show_bug.cgi?id=5243

Based on the patch from Shaohua Li <shaohua.li@intel.com>

Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Adam Belay <ambx1@neo.rr.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Oledzki 2007-10-16 23:31:08 -07:00 committed by Linus Torvalds
parent 7ef36390fa
commit 9cd8047b46
1 changed files with 10 additions and 0 deletions
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10
drivers/pnp/pnpacpi/rsparser.c
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@ -85,6 +85,16 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res,
if (i >= PNP_MAX_IRQ)
return;
#ifdef CONFIG_X86
if (gsi < 16 && (triggering != ACPI_EDGE_SENSITIVE ||
polarity != ACPI_ACTIVE_HIGH)) {
pnp_warn("BIOS BUG: legacy PNP IRQ %d should be edge trigger, "
"active high", gsi);
triggering = ACPI_EDGE_SENSITIVE;
polarity = ACPI_ACTIVE_HIGH;
}
#endif
res->irq_resource[i].flags = IORESOURCE_IRQ; // Also clears _UNSET flag
res->irq_resource[i].flags |= irq_flags(triggering, polarity);
irq = acpi_register_gsi(gsi, triggering, polarity);