target: Cleanup transport_kunmap_data_sg()

This code isn't broken per se, but it's scary to look at! It looks like
in the t_data_nents==1 case we're doing both a kunmap and a vunmap,
what's saving us is that t_data_vmap in this case is 0, so vunmap
doesn't do anything.

Return after kunmap, so the handling of the three cases does not overlap.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 42da7a300729..1520dd2dd718 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3546,10 +3546,12 @@ EXPORT_SYMBOL(transport_kmap_data_sg);
 
 void transport_kunmap_data_sg(struct se_cmd *cmd)
 {
-        if (!cmd->t_data_nents)
+        if (!cmd->t_data_nents) {
                 return;
-        else if (cmd->t_data_nents == 1)
+        } else if (cmd->t_data_nents == 1) {
                 kunmap(sg_page(cmd->t_data_sg));
+                return;
+        }
 
         vunmap(cmd->t_data_vmap);
         cmd->t_data_vmap = NULL;