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authorKrzysztof Oledzki <olel@ans.pl>2007-10-17 08:31:08 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 17:43:04 +0200
commit9cd8047b463f213c294f756119ac353312e7a152 (patch)
tree2e5440895a254d631b2a24fcf61e48ec9fe4707c /drivers
parentPNP: don't fail device init if no DMA channel available (diff)
downloadlinux-9cd8047b463f213c294f756119ac353312e7a152.tar.xz
linux-9cd8047b463f213c294f756119ac353312e7a152.zip
Fix very high interrupt rate for IRQ8 (rtc) unless pnpacpi=off
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pnp/pnpacpi/rsparser.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 0e3b8d0ff06b..cd0a204d96d1 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -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);