WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 20e9f64..98272fb 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -285,9 +285,10 @@
 	kfree(tprops);
 }
 
-static void ib_cache_task(void *work_ptr)
+static void ib_cache_task(struct work_struct *_work)
 {
-	struct ib_update_work *work = work_ptr;
+	struct ib_update_work *work =
+		container_of(_work, struct ib_update_work, work);
 
 	ib_cache_update(work->device, work->port_num);
 	kfree(work);
@@ -306,7 +307,7 @@
 	    event->event == IB_EVENT_CLIENT_REREGISTER) {
 		work = kmalloc(sizeof *work, GFP_ATOMIC);
 		if (work) {
-			INIT_WORK(&work->work, ib_cache_task, work);
+			INIT_WORK(&work->work, ib_cache_task);
 			work->device   = event->device;
 			work->port_num = event->element.port_num;
 			schedule_work(&work->work);