sh: Provide create_irq_nr() for dynamic IRQ creation by number.

This just reworks the existing create_irq_on_node() in to the new
create_irq_nr() which is generally exposed. This permits boards that
haven't converted over to sparseirq to try and use their existing ranges,
rather than having arbitrary vectors assigned to them.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 16 insertions, 12 deletions

diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index d5d7f23c19a5..7d286aedaeeb 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -872,7 +872,7 @@ device_initcall(register_intc_sysdevs);
 /*
  * Dynamic IRQ allocation and deallocation
  */
-static unsigned int create_irq_on_node(unsigned int irq_want, int node)
+unsigned int create_irq_nr(unsigned int irq_want, int node)
 {
         unsigned int irq = 0, new;
         unsigned long flags;
@@ -881,24 +881,28 @@ static unsigned int create_irq_on_node(unsigned int irq_want, int node)
         spin_lock_irqsave(&vector_lock, flags);
 
         /*
-         * First try the wanted IRQ, then scan.
+         * First try the wanted IRQ
          */
-        if (test_and_set_bit(irq_want, intc_irq_map)) {
+        if (test_and_set_bit(irq_want, intc_irq_map) == 0) {
+                new = irq_want;
+        } else {
+                /* .. then fall back to scanning. */
                 new = find_first_zero_bit(intc_irq_map, nr_irqs);
                 if (unlikely(new == nr_irqs))
                         goto out_unlock;
 
-                desc = irq_to_desc_alloc_node(new, node);
-                if (unlikely(!desc)) {
-                        pr_info("can't get irq_desc for %d\n", new);
-                        goto out_unlock;
-                }
-
-                desc = move_irq_desc(desc, node);
                 __set_bit(new, intc_irq_map);
-                irq = new;
         }
 
+        desc = irq_to_desc_alloc_node(new, node);
+        if (unlikely(!desc)) {
+                pr_info("can't get irq_desc for %d\n", new);
+                goto out_unlock;
+        }
+
+        desc = move_irq_desc(desc, node);
+        irq = new;
+
 out_unlock:
         spin_unlock_irqrestore(&vector_lock, flags);
 
@@ -913,7 +917,7 @@ int create_irq(void)
         int nid = cpu_to_node(smp_processor_id());
         int irq;
 
-        irq = create_irq_on_node(NR_IRQS_LEGACY, nid);
+        irq = create_irq_nr(NR_IRQS_LEGACY, nid);
         if (irq == 0)
                 irq = -1;