interrupt-handlin-time-detector.patch

2 files changed, 14 insertions, 3 deletions

diff --git a/arch/arm/kernel/iblock.c b/arch/arm/kernel/iblock.c
index 87b98048922..48632738b5f 100644
--- a/arch/arm/kernel/iblock.c
+++ b/arch/arm/kernel/iblock.c
@@ -29,7 +29,7 @@ unsigned long s3c2410_gettimeoffset(void);
 
 
 static unsigned long iblock_t0;
-static int iblock_limit;
+int iblock_limit;
 static int iblock_max;
 
 
@@ -64,9 +64,9 @@ void iblock_end(void)
 		return;
 	if (us < iblock_limit)
 		return;
-	iblock_limit = 0;
+//	iblock_limit = 0;
 	printk(KERN_ERR "interrupts were disabled for %lu us !\n", us);
-	WARN_ON(1);
+//	WARN_ON(1);
 }
 EXPORT_SYMBOL_GPL(iblock_end);
 
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 7141cee1fab..573d546b62e 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -104,6 +104,9 @@ static struct irq_desc bad_irq_desc = {
 	.lock = SPIN_LOCK_UNLOCKED
 };
 
+extern int iblock_limit;
+unsigned long s3c2410_gettimeoffset(void);
+
 /*
  * do_IRQ handles all hardware IRQ's.  Decoded IRQs should not
  * come via this function.  Instead, they should provide their
@@ -112,9 +115,12 @@ static struct irq_desc bad_irq_desc = {
 asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
+	unsigned long us;
 
 	irq_enter();
 
+	us = s3c2410_gettimeoffset();
+
 	/*
 	 * Some hardware gives randomly wrong interrupts.  Rather
 	 * than crashing, do something sensible.
@@ -124,6 +130,11 @@ asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 	else
 		generic_handle_irq(irq);
 
+	us = s3c2410_gettimeoffset() - us;
+
+	if (iblock_limit && us > iblock_limit && us < 10000000)
+		printk(KERN_ERR "asm_do_IRQ(%u): %lu us\n", irq, us);
+
 	/* AT91 specific workaround */
 	irq_finish(irq);