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>
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 0921a64..51127d1 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -139,6 +139,11 @@
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;