IB/cxgb3: convert to idr_alloc()

Convert to the much saner new idr interface.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/infiniband/hw/cxgb3/iwch.h

@@ -153,19 +153,17 @@ static inline int insert_handle(struct iwch_dev *rhp, struct idr *idr,
 				void *handle, u32 id)
 {
 	int ret;
-	int newid;
 
-	do {
-		if (!idr_pre_get(idr, GFP_KERNEL)) {
-			return -ENOMEM;
-		}
+	idr_preload(GFP_KERNEL);
 	spin_lock_irq(&rhp->lock);
-		ret = idr_get_new_above(idr, handle, id, &newid);
-		BUG_ON(newid != id);
+
+	ret = idr_alloc(idr, handle, id, id + 1, GFP_NOWAIT);
+
 	spin_unlock_irq(&rhp->lock);
-	} while (ret == -EAGAIN);
+	idr_preload_end();
 
-	return ret;
+	BUG_ON(ret == -ENOSPC);
+	return ret < 0 ? ret : 0;
 }
 
 static inline void remove_handle(struct iwch_dev *rhp, struct idr *idr, u32 id)