libertas: use spin_is_locked() instead of spin_trylock() in lbs_interrupt()

We get scary warnings on UP if we use spin_trylock() and find, as we
hoped, that the lock in question is already locked.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 9232b975a42c..5d2bf539d4b9 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -1414,8 +1414,7 @@ void lbs_interrupt(struct lbs_private *priv)
 
         lbs_deb_thread("lbs_interrupt: intcounter=%d\n", priv->intcounter);
 
-        if (spin_trylock(&priv->driver_lock)) {
-                spin_unlock(&priv->driver_lock);
+        if (!spin_is_locked(&priv->driver_lock)) {
                 printk(KERN_CRIT "%s called without driver_lock held\n", __func__);
                 WARN_ON(1);
         }