r8169: multicast register update (sync with Realtek's 8.004.00 8168 driver)

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

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 80eab7a0420597ec0c27fe7eaefe12a5868674b9..46d6611a33bbe4a7997637168feb543acd0f0b8e 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/interrupt.h>
+#include <linux/slab.h>
 
 #include "internals.h"
 
@@ -29,12 +30,28 @@
 void synchronize_irq(unsigned int irq)
 {
        struct irq_desc *desc = irq_desc + irq;
+       unsigned int status;
 
        if (irq >= NR_IRQS)
                return;
 
-       while (desc->status & IRQ_INPROGRESS)
-               cpu_relax();
+       do {
+               unsigned long flags;
+
+               /*
+                * Wait until we're out of the critical section.  This might
+                * give the wrong answer due to the lack of memory barriers.
+                */
+               while (desc->status & IRQ_INPROGRESS)
+                       cpu_relax();
+
+               /* Ok, that indicated we're done: double-check carefully. */
+               spin_lock_irqsave(&desc->lock, flags);
+               status = desc->status;
+               spin_unlock_irqrestore(&desc->lock, flags);
+
+               /* Oops, that failed? */
+       } while (status & IRQ_INPROGRESS);
 }
 EXPORT_SYMBOL(synchronize_irq);
 
@@ -133,6 +150,26 @@ void disable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(disable_irq);
 
+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);
+               break;
+       case 1: {
+               unsigned int status = desc->status & ~IRQ_DISABLED;
+
+               /* Prevent probing on this irq: */
+               desc->status = status | IRQ_NOPROBE;
+               check_irq_resend(desc, irq);
+               /* fall-through */
+       }
+       default:
+               desc->depth--;
+       }
+}
+
 /**
  *     enable_irq - enable handling of an irq
  *     @irq: Interrupt to enable
@@ -152,22 +189,7 @@ void enable_irq(unsigned int irq)
                return;
 
        spin_lock_irqsave(&desc->lock, flags);
-       switch (desc->depth) {
-       case 0:
-               printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
-               WARN_ON(1);
-               break;
-       case 1: {
-               unsigned int status = desc->status & ~IRQ_DISABLED;
-
-               /* Prevent probing on this irq: */
-               desc->status = status | IRQ_NOPROBE;
-               check_irq_resend(desc, irq);
-               /* fall-through */
-       }
-       default:
-               desc->depth--;
-       }
+       __enable_irq(desc, irq);
        spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(enable_irq);
@@ -348,7 +370,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                        compat_irq_chip_set_default_handler(desc);
 
                desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
-                                 IRQ_INPROGRESS);
+                                 IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED);
 
                if (!(desc->status & IRQ_NOAUTOEN)) {
                        desc->depth = 0;
@@ -364,6 +386,16 @@ int setup_irq(unsigned int irq, struct irqaction *new)
        /* Reset broken irq detection when installing new handler */
        desc->irq_count = 0;
        desc->irqs_unhandled = 0;
+
+       /*
+        * Check whether we disabled the irq via the spurious handler
+        * before. Reenable it and give it another chance.
+        */
+       if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) {
+               desc->status &= ~IRQ_SPURIOUS_DISABLED;
+               __enable_irq(desc, irq);
+       }
+
        spin_unlock_irqrestore(&desc->lock, flags);
 
        new->irq = irq;
@@ -463,6 +495,9 @@ void free_irq(unsigned int irq, void *dev_id)
                        return;
                }
                printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
+#ifdef CONFIG_DEBUG_SHIRQ
+               dump_stack();
+#endif
                spin_unlock_irqrestore(&desc->lock, flags);
                return;
        }