target: Don't allocate pages for NULLIO devices

Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
mariux64 · Jun 14, 2013 · 670caa9 · 670caa9
1 parent db5d1c3
commit 670caa9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
@@ -139,6 +139,11 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
 			rd_dev->rd_page_count);
 		return -EINVAL;
 	}
+
+	/* Don't need backing pages for NULLIO */
+	if (rd_dev->rd_flags & RDF_NULLIO)
+		return 0;
+
 	total_sg_needed = rd_dev->rd_page_count;
 
 	sg_tables = (total_sg_needed / max_sg_per_table) + 1;