[PATCH] rtc: fix idr locking

We need to serialize access to the global rtc_idr even in this error path.

Signed-off-by: Sonny Rao <sonny@burdell.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 5396beec30d0..1cb61a761cb2 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -94,7 +94,9 @@ exit_kfree:
         kfree(rtc);
 
 exit_idr:
+        mutex_lock(&idr_lock);
         idr_remove(&rtc_idr, id);
+        mutex_unlock(&idr_lock);
 
 exit:
         dev_err(dev, "rtc core: unable to register %s, err = %d\n",