nilfs2: fix buggy behavior seen in enumerating checkpoints

[linux-2.6-omap-h63xx.git] / kernel / irq / manage.c

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 6458e99984c08f3af7a108ac0f7db03b21a7e5e8..1516ab77355c928bd1e1f5c8b6759e53d3b0c7e3 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -162,6 +162,20 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *desc)
 }
 #endif
 
+void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
+{
+       if (suspend) {
+               if (!desc->action || (desc->action->flags & IRQF_TIMER))
+                       return;
+               desc->status |= IRQ_SUSPENDED;
+       }
+
+       if (!desc->depth++) {
+               desc->status |= IRQ_DISABLED;
+               desc->chip->disable(irq);
+       }
+}
+
 /**
  *     disable_irq_nosync - disable an irq without waiting
  *     @irq: Interrupt to disable
@@ -182,10 +196,7 @@ void disable_irq_nosync(unsigned int irq)
                return;
 
        spin_lock_irqsave(&desc->lock, flags);
-       if (!desc->depth++) {
-               desc->status |= IRQ_DISABLED;
-               desc->chip->disable(irq);
-       }
+       __disable_irq(desc, irq, false);
        spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(disable_irq_nosync);
@@ -215,15 +226,21 @@ void disable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(disable_irq);
 
-static void __enable_irq(struct irq_desc *desc, unsigned int irq)
+void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)
 {
+       if (resume)
+               desc->status &= ~IRQ_SUSPENDED;
+
        switch (desc->depth) {
        case 0:
+ err_out:
                WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
                break;
        case 1: {
                unsigned int status = desc->status & ~IRQ_DISABLED;
 
+               if (desc->status & IRQ_SUSPENDED)
+                       goto err_out;
                /* Prevent probing on this irq: */
                desc->status = status | IRQ_NOPROBE;
                check_irq_resend(desc, irq);
@@ -253,7 +270,7 @@ void enable_irq(unsigned int irq)
                return;
 
        spin_lock_irqsave(&desc->lock, flags);
-       __enable_irq(desc, irq);
+       __enable_irq(desc, irq, false);
        spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(enable_irq);
@@ -511,7 +528,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
         */
        if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) {
                desc->status &= ~IRQ_SPURIOUS_DISABLED;
-               __enable_irq(desc, irq);
+               __enable_irq(desc, irq, false);
        }
 
        spin_unlock_irqrestore(&desc->lock, flags);