orinoco: do not resgister NULL pm_notifier function

With DEBUG_NOTIFIERS it results in

[11330.890966] WARNING: at /home/bor/src/linux-git/kernel/notifier.c:88
notifier_call_chain+0x91/0xa0()
[11330.890977] Hardware name: PORTEGE 4000
[11330.890983] Invalid notifier called! ...

Without DEBUG_NOTIFIERS it most likely crashes on NULL pointer.

Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Acked-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/net/wireless/orinoco/orinoco.c b/drivers/net/wireless/orinoco/orinoco.c
index 45a04faa7818..067d1a9c728b 100644
--- a/drivers/net/wireless/orinoco/orinoco.c
+++ b/drivers/net/wireless/orinoco/orinoco.c
@@ -3157,8 +3157,20 @@ static int orinoco_pm_notifier(struct notifier_block *notifier,
 
         return NOTIFY_DONE;
 }
+
+static void orinoco_register_pm_notifier(struct orinoco_private *priv)
+{
+        priv->pm_notifier.notifier_call = orinoco_pm_notifier;
+        register_pm_notifier(&priv->pm_notifier);
+}
+
+static void orinoco_unregister_pm_notifier(struct orinoco_private *priv)
+{
+        unregister_pm_notifier(&priv->pm_notifier);
+}
 #else /* !PM_SLEEP || HERMES_CACHE_FW_ON_INIT */
-#define orinoco_pm_notifier NULL
+#define orinoco_register_pm_notifier(priv) do { } while(0)
+#define orinoco_unregister_pm_notifier(priv) do { } while(0)
 #endif
 
 /********************************************************************/
@@ -3648,8 +3660,7 @@ struct net_device
         priv->cached_fw = NULL;
 
         /* Register PM notifiers */
-        priv->pm_notifier.notifier_call = orinoco_pm_notifier;
-        register_pm_notifier(&priv->pm_notifier);
+        orinoco_register_pm_notifier(priv);
 
         return dev;
 }
@@ -3673,7 +3684,7 @@ void free_orinocodev(struct net_device *dev)
                 kfree(rx_data);
         }
 
-        unregister_pm_notifier(&priv->pm_notifier);
+        orinoco_unregister_pm_notifier(priv);
         orinoco_uncache_fw(priv);
 
         priv->wpa_ie_len = 0;