[PATCH] genirq: sem2mutex probe_sem -> probing_active

Convert the irq auto-probing semaphore to a mutex.  (This allows us to find
probing API usage bugs sooner, via the mutex debugging code.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 6f1e68a46cbc..d1f1e6f10a23 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -16,7 +16,7 @@
  * comes in on to an unassigned handler will get stuck with
  * "IRQ_WAITING" cleared and the interrupt disabled.
  */
-static DECLARE_MUTEX(probe_sem);
+static DEFINE_MUTEX(probing_active);
 
 /**
  *      probe_irq_on    - begin an interrupt autodetect
@@ -31,7 +31,7 @@ unsigned long probe_irq_on(void)
         irq_desc_t *desc;
         unsigned int i;
 
-        down(&probe_sem);
+        mutex_lock(&probing_active);
         /*
          * something may have generated an irq long ago and we want to
          * flush such a longstanding irq before considering it as spurious.
@@ -132,7 +132,7 @@ unsigned int probe_irq_mask(unsigned long val)
                 }
                 spin_unlock_irq(&desc->lock);
         }
-        up(&probe_sem);
+        mutex_unlock(&probing_active);
 
         return mask & val;
 }
@@ -177,10 +177,11 @@ int probe_irq_off(unsigned long val)
                 }
                 spin_unlock_irq(&desc->lock);
         }
-        up(&probe_sem);
+        mutex_unlock(&probing_active);
 
         if (nr_irqs > 1)
                 irq_found = -irq_found;
+
         return irq_found;
 }