[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>
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 6f1e68a..d1f1e6f 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 @@
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 @@
}
spin_unlock_irq(&desc->lock);
}
- up(&probe_sem);
+ mutex_unlock(&probing_active);
return mask & val;
}
@@ -177,10 +177,11 @@
}
spin_unlock_irq(&desc->lock);
}
- up(&probe_sem);
+ mutex_unlock(&probing_active);
if (nr_irqs > 1)
irq_found = -irq_found;
+
return irq_found;
}