target/iblock: Add checks for backend DIF emulation

Make sure that IBLOCK only attempts to use backend DIF emulation
when it's actually enabled at device level.

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 2520cbf..1b7947c 100644 (file)
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -774,7 +774,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
                sg_num--;
        }
 
-       if (cmd->prot_type) {
+       if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
                int rc = iblock_alloc_bip(cmd, bio_start);
                if (rc)
                        goto fail_put_bios;