X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=kernel%2Firq%2Fspurious.c;h=a6b2bc831dd05be5ee9cbff347566bf410870c26;hb=6208e77e7fa9e69f399fddc55b1cf9527fbde599;hp=bd9e272d55e9f007984b06e0999f6a37bb7208e1;hpb=9539ce2253ab1b054e9b0daf0abe0fd4263e1820;p=linux-2.6

diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index bd9e272d55..a6b2bc831d 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/kallsyms.h>
 #include <linux/interrupt.h>
+#include <linux/moduleparam.h>
 
 static int irqfixup __read_mostly;
 
@@ -172,7 +173,17 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
 		    irqreturn_t action_ret)
 {
 	if (unlikely(action_ret != IRQ_HANDLED)) {
-		desc->irqs_unhandled++;
+		/*
+		 * If we are seeing only the odd spurious IRQ caused by
+		 * bus asynchronicity then don't eventually trigger an error,
+		 * otherwise the couter becomes a doomsday timer for otherwise
+		 * working systems
+		 */
+		if (jiffies - desc->last_unhandled > HZ/10)
+			desc->irqs_unhandled = 1;
+		else
+			desc->irqs_unhandled++;
+		desc->last_unhandled = jiffies;
 		if (unlikely(action_ret != IRQ_NONE))
 			report_bad_irq(irq, desc, action_ret);
 	}
@@ -215,6 +226,8 @@ int noirqdebug_setup(char *str)
 }
 
 __setup("noirqdebug", noirqdebug_setup);
+module_param(noirqdebug, bool, 0644);
+MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
 
 static int __init irqfixup_setup(char *str)
 {
@@ -226,6 +239,8 @@ static int __init irqfixup_setup(char *str)
 }
 
 __setup("irqfixup", irqfixup_setup);
+module_param(irqfixup, int, 0644);
+MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode 2: irqpoll mode");
 
 static int __init irqpoll_setup(char *str)
 {