iscsi-target: add void (*iscsit_release_cmd)()

Add void (*iscsit_release_cmd)() to
struct iscsit_transport, iscsi-target
uses this callback to release transport
driver resources associated with an iSCSI cmd.

cxgbit.ko needs this callback to release DDP
resource and sg page in case of
PASSTHROUGH_SG_TO_MEM_NOALLOC.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 428b0d9e3dba..a5330171ebe5 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -725,6 +725,9 @@ void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
                 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
                 iscsit_remove_cmd_from_response_queue(cmd, conn);
         }
+
+        if (conn && conn->conn_transport->iscsit_release_cmd)
+                conn->conn_transport->iscsit_release_cmd(conn, cmd);
 }
 
 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
diff --git a/include/target/iscsi/iscsi_transport.h b/include/target/iscsi/iscsi_transport.h
index 24b613a09aee..3b0053efdfba 100644
--- a/include/target/iscsi/iscsi_transport.h
+++ b/include/target/iscsi/iscsi_transport.h
@@ -24,6 +24,7 @@ struct iscsit_transport {
         void (*iscsit_aborted_task)(struct iscsi_conn *, struct iscsi_cmd *);
         int (*iscsit_xmit_pdu)(struct iscsi_conn *, struct iscsi_cmd *,
                                struct iscsi_datain_req *, const void *, u32);
+        void (*iscsit_release_cmd)(struct iscsi_conn *, struct iscsi_cmd *);
         enum target_prot_op (*iscsit_get_sup_prot_ops)(struct iscsi_conn *);
 };