RDS: Fix BUG_ONs to not fire when in a tasklet

in_interrupt() is true in softirqs. The BUG_ONs are supposed
to check for if irqs are disabled, so we should use
BUG_ON(irqs_disabled()) instead, duh.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 75fd13b..3b442d4 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -440,7 +440,7 @@
 		 * is the case for a RDMA_READ which copies from remote
 		 * to local memory */
 		if (!ro->r_write) {
-			BUG_ON(in_interrupt());
+			BUG_ON(irqs_disabled());
 			set_page_dirty(page);
 		}
 		put_page(page);