[PATCH] target: Fix SCF_SCSI_CONTROL_SG_IO_CDB breakage

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch fixes a bug introduced during the v4 control CDB emulation
refactoring that broke SCF_SCSI_CONTROL_SG_IO_CDB operation within
transport_map_control_cmd_to_task().  It moves the BUG_ON() into
transport_do_se_mem_map() after the TRANSPORT(dev)->do_se_mem_map()
RAMDISK_DR special case, and adds the proper struct se_mem assignment
when !list_empty() for normal non RAMDISK_DR backend device cases.

Reported-by: Kai-Thorsten Hambrecht <kai@hambrecht.org>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
 drivers/target/target_core_transport.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index b2ff1b1..b2fc558 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -4855,6 +4855,8 @@ static int transport_do_se_mem_map(
 
 		return ret;
 	}
+
+	BUG_ON(list_empty(se_mem_list));
 	/*
 	 * This is the normal path for all normal non BIDI and BIDI-COMMAND
 	 * WRITE payloads..  If we need to do BIDI READ passthrough for
@@ -5036,7 +5038,9 @@ transport_map_control_cmd_to_task(struct se_cmd *cmd)
 		struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
 		u32 se_mem_cnt = 0, task_offset = 0;
 
-		BUG_ON(list_empty(cmd->t_task->t_mem_list));
+		if (!list_empty(T_TASK(cmd)->t_mem_list))
+			se_mem = list_entry(T_TASK(cmd)->t_mem_list->next,
+					struct se_mem, se_list);
 
 		ret = transport_do_se_mem_map(dev, task,
 				cmd->t_task->t_mem_list, NULL, se_mem,
-- 
1.5.6.5