[PATCH] i2o: destroy event queue only when drv->event is set

[Akinobu Mita <akinobu.mita@gmail.com>]

i2o_driver_register() initalizes event queue for driver
only when drv->event is set. So similarly the event queue
should be destroyed only when drv->event is set in the error path.
Otherwise destroy_workqueue() will called with NULL.

Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

---
 drivers/message/i2o/driver.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: 2.6-mm/drivers/message/i2o/driver.c
===================================================================
--- 2.6-mm.orig/drivers/message/i2o/driver.c
+++ 2.6-mm/drivers/message/i2o/driver.c
@@ -123,8 +123,12 @@ int i2o_driver_register(struct i2o_drive
 	}
 
 	rc = driver_register(&drv->driver);
-	if (rc)
-		destroy_workqueue(drv->event_queue);
+	if (rc) {
+		if (drv->event) {
+			destroy_workqueue(drv->event_queue);
+			drv->event_queue = NULL;
+		}
+	}
 
 	return rc;
 };
-
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