iscsi-target: Fix non-immediate TMR handling

This patch addresses two issues with non immediate TMR handling in
iscsit_handle_task_mgt_cmd().  The first involves breakage due to
v3.1-rc conversion of iscsit_sequence_cmd(), which upon good status
would hit the iscsit_add_reject_from_cmd() block of code.  This patch
adds an explict check for CMDSN_ERROR_CANNOT_RECOVER.

The second adds a check to return when non immediate TMR operation is
detected after iscsit_ack_from_expstatsn(), as iscsit_sequence_cmd()
-> iscsit_execute_cmd() will have called transport_generic_handle_tmr()
for the non immediate TMR case already.

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

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 7855a63d49fc..1bf057ed9931 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1821,17 +1821,16 @@ attach:
                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
                         out_of_order_cmdsn = 1;
-                else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+                else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
                         return 0;
-                } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+                else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
                         return iscsit_add_reject_from_cmd(
                                         ISCSI_REASON_PROTOCOL_ERROR,
                                         1, 0, buf, cmd);
-                }
         }
         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
 
-        if (out_of_order_cmdsn)
+        if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
                 return 0;
         /*
          * Found the referenced task, send to transport for processing.