1 files changed, 72 insertions, 39 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 77a51be36010..0314074fa232 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -177,8 +177,7 @@ static void __enable_irq(struct irq_desc *desc, unsigned int irq)
 {
         switch (desc->depth) {
         case 0:
-                printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
-                WARN_ON(1);
+                WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
                 break;
         case 1: {
                 unsigned int status = desc->status & ~IRQ_DISABLED;
@@ -217,6 +216,17 @@ void enable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(enable_irq);
 
+int set_irq_wake_real(unsigned int irq, unsigned int on)
+{
+        struct irq_desc *desc = irq_desc + irq;
+        int ret = -ENXIO;
+
+        if (desc->chip->set_wake)
+                ret = desc->chip->set_wake(irq, on);
+
+        return ret;
+}
+
 /**
  *      set_irq_wake - control irq power management wakeup
  *      @irq:   interrupt to control
@@ -233,30 +243,32 @@ int set_irq_wake(unsigned int irq, unsigned int on)
 {
         struct irq_desc *desc = irq_desc + irq;
         unsigned long flags;
-        int ret = -ENXIO;
-        int (*set_wake)(unsigned, unsigned) = desc->chip->set_wake;
+        int ret = 0;
 
         /* wakeup-capable irqs can be shared between drivers that
          * don't need to have the same sleep mode behaviors.
          */
         spin_lock_irqsave(&desc->lock, flags);
         if (on) {
-                if (desc->wake_depth++ == 0)
-                        desc->status |= IRQ_WAKEUP;
-                else
-                        set_wake = NULL;
+                if (desc->wake_depth++ == 0) {
+                        ret = set_irq_wake_real(irq, on);
+                        if (ret)
+                                desc->wake_depth = 0;
+                        else
+                                desc->status |= IRQ_WAKEUP;
+                }
         } else {
                 if (desc->wake_depth == 0) {
-                        printk(KERN_WARNING "Unbalanced IRQ %d "
-                                        "wake disable\n", irq);
-                        WARN_ON(1);
-                } else if (--desc->wake_depth == 0)
-                        desc->status &= ~IRQ_WAKEUP;
-                else
-                        set_wake = NULL;
+                        WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
+                } else if (--desc->wake_depth == 0) {
+                        ret = set_irq_wake_real(irq, on);
+                        if (ret)
+                                desc->wake_depth = 1;
+                        else
+                                desc->status &= ~IRQ_WAKEUP;
+                }
         }
-        if (set_wake)
-                ret = desc->chip->set_wake(irq, on);
+
         spin_unlock_irqrestore(&desc->lock, flags);
         return ret;
 }
@@ -293,6 +305,31 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
                 desc->handle_irq = NULL;
 }
 
+static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
+                unsigned long flags)
+{
+        int ret;
+
+        if (!chip || !chip->set_type) {
+                /*
+                 * IRQF_TRIGGER_* but the PIC does not support multiple
+                 * flow-types?
+                 */
+                pr_warning("No set_type function for IRQ %d (%s)\n", irq,
+                                chip ? (chip->name ? : "unknown") : "unknown");
+                return 0;
+        }
+
+        ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+
+        if (ret)
+                pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
+                                (int)(flags & IRQF_TRIGGER_MASK),
+                                irq, chip->set_type);
+
+        return ret;
+}
+
 /*
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
@@ -304,6 +341,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
         const char *old_name = NULL;
         unsigned long flags;
         int shared = 0;
+        int ret;
 
         if (irq >= NR_IRQS)
                 return -EINVAL;
@@ -361,35 +399,23 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                 shared = 1;
         }
 
-        *p = new;
-
-        /* Exclude IRQ from balancing */
-        if (new->flags & IRQF_NOBALANCING)
-                desc->status |= IRQ_NO_BALANCING;
-
         if (!shared) {
                 irq_chip_set_defaults(desc->chip);
 
-#if defined(CONFIG_IRQ_PER_CPU)
-                if (new->flags & IRQF_PERCPU)
-                        desc->status |= IRQ_PER_CPU;
-#endif
-
                 /* Setup the type (level, edge polarity) if configured: */
                 if (new->flags & IRQF_TRIGGER_MASK) {
-                        if (desc->chip->set_type)
-                                desc->chip->set_type(irq,
-                                                new->flags & IRQF_TRIGGER_MASK);
-                        else
-                                /*
-                                 * IRQF_TRIGGER_* but the PIC does not support
-                                 * multiple flow-types?
-                                 */
-                                printk(KERN_WARNING "No IRQF_TRIGGER set_type "
-                                       "function for IRQ %d (%s)\n", irq,
-                                       desc->chip->name);
+                        ret = __irq_set_trigger(desc->chip, irq, new->flags);
+
+                        if (ret) {
+                                spin_unlock_irqrestore(&desc->lock, flags);
+                                return ret;
+                        }
                 } else
                         compat_irq_chip_set_default_handler(desc);
+#if defined(CONFIG_IRQ_PER_CPU)
+                if (new->flags & IRQF_PERCPU)
+                        desc->status |= IRQ_PER_CPU;
+#endif
 
                 desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
                                   IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED);
@@ -408,6 +434,13 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                 /* Set default affinity mask once everything is setup */
                 irq_select_affinity(irq);
         }
+
+        *p = new;
+
+        /* Exclude IRQ from balancing */
+        if (new->flags & IRQF_NOBALANCING)
+                desc->status |= IRQ_NO_BALANCING;
+
         /* Reset broken irq detection when installing new handler */
         desc->irq_count = 0;
         desc->irqs_unhandled = 0;