tcm_fc: Convert to TARGET_SCF_ACK_KREF I/O + TMR krefs

This patch converts tcm_fc to modern TARGET_SCF_ACK_KREF
usage for ft_queue_status(), and fixes ft_check_stop_free()
to return transport_generic_free_cmd() for ->cmd_kref.

It also converts TM request -> ft_send_tm() to use ACK_KREF,
and update ft_queue_tm_resp() to drop the outstanding kref
after queueing TM response into fabric code.

Cc: Vasu Dev <vasu.dev@linux.intel.com>
Cc: Mark Rustad <mark.d.rustad@intel.com>
Cc: Robert Love <robert.w.love@intel.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 064d6df..216e18c 100644 (file)
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -107,8 +107,7 @@ void ft_release_cmd(struct se_cmd *se_cmd)
 
 int ft_check_stop_free(struct se_cmd *se_cmd)
 {
-       transport_generic_free_cmd(se_cmd, 0);
-       return 1;
+       return transport_generic_free_cmd(se_cmd, 0);
 }
 
 /*
@@ -179,6 +178,12 @@ int ft_queue_status(struct se_cmd *se_cmd)
                return -ENOMEM;
        }
        lport->tt.exch_done(cmd->seq);
+       /*
+        * Drop the extra ACK_KREF reference taken by target_submit_cmd()
+        * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
+        * final se_cmd->cmd_kref put.
+        */
+       target_put_sess_cmd(&cmd->se_cmd);
        return 0;
 }
 
@@ -387,7 +392,7 @@ static void ft_send_tm(struct ft_cmd *cmd)
        /* FIXME: Add referenced task tag for ABORT_TASK */
        rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess,
                &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
-               cmd, tm_func, GFP_KERNEL, 0, 0);
+               cmd, tm_func, GFP_KERNEL, 0, TARGET_SCF_ACK_KREF);
        if (rc < 0)
                ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 }
@@ -422,6 +427,12 @@ void ft_queue_tm_resp(struct se_cmd *se_cmd)
        pr_debug("tmr fn %d resp %d fcp code %d\n",
                  tmr->function, tmr->response, code);
        ft_send_resp_code(cmd, code);
+       /*
+        * Drop the extra ACK_KREF reference taken by target_submit_tmr()
+        * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
+        * final se_cmd->cmd_kref put.
+        */
+       target_put_sess_cmd(&cmd->se_cmd);
 }
 
 void ft_aborted_task(struct se_cmd *se_cmd)
@@ -560,7 +571,8 @@ static void ft_send_work(struct work_struct *work)
         */
        if (target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb,
                              &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
-                             ntohl(fcp->fc_dl), task_attr, data_dir, 0))
+                             ntohl(fcp->fc_dl), task_attr, data_dir,
+                             TARGET_SCF_ACK_KREF))
                goto err;
 
        pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);