1 files changed, 51 insertions, 35 deletions

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 282f20230e67..2c039c9b9383 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -79,7 +79,8 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
         desc->irq_data.chip_data = NULL;
         desc->irq_data.handler_data = NULL;
         desc->irq_data.msi_desc = NULL;
-        desc->status = IRQ_DEFAULT_INIT_FLAGS;
+        irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
+        irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
         desc->handle_irq = handle_bad_irq;
         desc->depth = 1;
         desc->irq_count = 0;
@@ -94,7 +95,7 @@ int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
 static DEFINE_MUTEX(sparse_irq_lock);
-static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
+static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
 
 #ifdef CONFIG_SPARSE_IRQ
 
@@ -197,13 +198,12 @@ err:
         return -ENOMEM;
 }
 
-struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
+static int irq_expand_nr_irqs(unsigned int nr)
 {
-        int res = irq_alloc_descs(irq, irq, 1, node);
-
-        if (res == -EEXIST || res == irq)
-                return irq_to_desc(irq);
-        return NULL;
+        if (nr > IRQ_BITMAP_BITS)
+                return -ENOMEM;
+        nr_irqs = nr;
+        return 0;
 }
 
 int __init early_irq_init(void)
@@ -217,6 +217,15 @@ int __init early_irq_init(void)
         initcnt = arch_probe_nr_irqs();
         printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
 
+        if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
+                nr_irqs = IRQ_BITMAP_BITS;
+
+        if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
+                initcnt = IRQ_BITMAP_BITS;
+
+        if (initcnt > nr_irqs)
+                nr_irqs = initcnt;
+
         for (i = 0; i < initcnt; i++) {
                 desc = alloc_desc(i, node);
                 set_bit(i, allocated_irqs);
@@ -229,7 +238,6 @@ int __init early_irq_init(void)
 
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         [0 ... NR_IRQS-1] = {
-                .status         = IRQ_DEFAULT_INIT_FLAGS,
                 .handle_irq     = handle_bad_irq,
                 .depth          = 1,
                 .lock           = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
@@ -251,8 +259,8 @@ int __init early_irq_init(void)
         for (i = 0; i < count; i++) {
                 desc[i].irq_data.irq = i;
                 desc[i].irq_data.chip = &no_irq_chip;
-                /* TODO : do this allocation on-demand ... */
                 desc[i].kstat_irqs = alloc_percpu(unsigned int);
+                irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
                 alloc_masks(desc + i, GFP_KERNEL, node);
                 desc_smp_init(desc + i, node);
                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
@@ -265,11 +273,6 @@ struct irq_desc *irq_to_desc(unsigned int irq)
         return (irq < NR_IRQS) ? irq_desc + irq : NULL;
 }
 
-struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
-{
-        return irq_to_desc(irq);
-}
-
 static void free_desc(unsigned int irq)
 {
         dynamic_irq_cleanup(irq);
@@ -277,24 +280,14 @@ static void free_desc(unsigned int irq)
 
 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
 {
-#if defined(CONFIG_KSTAT_IRQS_ONDEMAND)
-        struct irq_desc *desc;
-        unsigned int i;
-
-        for (i = 0; i < cnt; i++) {
-                desc = irq_to_desc(start + i);
-                if (desc && !desc->kstat_irqs) {
-                        unsigned int __percpu *stats = alloc_percpu(unsigned int);
-
-                        if (!stats)
-                                return -1;
-                        if (cmpxchg(&desc->kstat_irqs, NULL, stats) != NULL)
-                                free_percpu(stats);
-                }
-        }
-#endif
         return start;
 }
+
+static int irq_expand_nr_irqs(unsigned int nr)
+{
+        return -ENOMEM;
+}
+
 #endif /* !CONFIG_SPARSE_IRQ */
 
 /* Dynamic interrupt handling */
@@ -338,14 +331,17 @@ irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node)
 
         mutex_lock(&sparse_irq_lock);
 
-        start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
+        start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
+                                           from, cnt, 0);
         ret = -EEXIST;
         if (irq >=0 && start != irq)
                 goto err;
 
-        ret = -ENOMEM;
-        if (start >= nr_irqs)
-                goto err;
+        if (start + cnt > nr_irqs) {
+                ret = irq_expand_nr_irqs(start + cnt);
+                if (ret)
+                        goto err;
+        }
 
         bitmap_set(allocated_irqs, start, cnt);
         mutex_unlock(&sparse_irq_lock);
@@ -392,6 +388,26 @@ unsigned int irq_get_next_irq(unsigned int offset)
         return find_next_bit(allocated_irqs, nr_irqs, offset);
 }
 
+struct irq_desc *
+__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        if (desc) {
+                if (bus)
+                        chip_bus_lock(desc);
+                raw_spin_lock_irqsave(&desc->lock, *flags);
+        }
+        return desc;
+}
+
+void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
+{
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+        if (bus)
+                chip_bus_sync_unlock(desc);
+}
+
 /**
  * dynamic_irq_cleanup - cleanup a dynamically allocated irq
  * @irq:        irq number to initialize