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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 0921a64b5550..51127d15d5c5 100644
--- 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;