1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 73ab75ddaf42..6d2f37578b29 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -179,7 +179,7 @@ static void tcm_loop_submission_work(struct work_struct *work)
         struct tcm_loop_hba *tl_hba;
         struct tcm_loop_tpg *tl_tpg;
         struct scatterlist *sgl_bidi = NULL;
-        u32 sgl_bidi_count = 0;
+        u32 sgl_bidi_count = 0, transfer_length;
         int rc;
 
         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
@@ -213,12 +213,21 @@ static void tcm_loop_submission_work(struct work_struct *work)
 
         }
 
-        if (!scsi_prot_sg_count(sc) && scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
+        transfer_length = scsi_transfer_length(sc);
+        if (!scsi_prot_sg_count(sc) &&
+            scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
                 se_cmd->prot_pto = true;
+                /*
+                 * loopback transport doesn't support
+                 * WRITE_GENERATE, READ_STRIP protection
+                 * information operations, go ahead unprotected.
+                 */
+                transfer_length = scsi_bufflen(sc);
+        }
 
         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
-                        scsi_bufflen(sc), tcm_loop_sam_attr(sc),
+                        transfer_length, tcm_loop_sam_attr(sc),
                         sc->sc_data_direction, 0,
                         scsi_sglist(sc), scsi_sg_count(sc),
                         sgl_bidi, sgl_bidi_count,