target: Remove se_session.sess_wait_list

Since we set se_session.sess_tearing_down and stop new commands from
being added to se_session.sess_cmd_list before we wait for commands to
finish when freeing a session, there's no need for a separate
sess_wait_list -- if we let new commands be added to sess_cmd_list
after setting sess_tearing_down, that would be a bug that breaks the
logic of waiting in-flight commands.

Also rename target_splice_sess_cmd_list() to
target_sess_cmd_list_set_waiting(), since we are no longer splicing
onto a separate list.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index e131d68..65a7ed9 100644 (file)
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -464,7 +464,7 @@ static int tcm_qla2xxx_shutdown_session(struct se_session *se_sess)
        vha = sess->vha;
 
        spin_lock_irqsave(&vha->hw->hardware_lock, flags);
-       target_splice_sess_cmd_list(se_sess);
+       target_sess_cmd_list_set_waiting(se_sess);
        spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
 
        return 1;

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index a979514..357bb24 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -232,7 +232,6 @@ struct se_session *transport_init_session(void)
        INIT_LIST_HEAD(&se_sess->sess_list);
        INIT_LIST_HEAD(&se_sess->sess_acl_list);
        INIT_LIST_HEAD(&se_sess->sess_cmd_list);
-       INIT_LIST_HEAD(&se_sess->sess_wait_list);
        spin_lock_init(&se_sess->sess_cmd_lock);
        kref_init(&se_sess->sess_kref);
 
@@ -2478,28 +2477,27 @@ int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
 }
 EXPORT_SYMBOL(target_put_sess_cmd);
 
-/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
- * @se_sess:   session to split
+/* target_sess_cmd_list_set_waiting - Flag all commands in
+ *         sess_cmd_list to complete cmd_wait_comp.  Set
+ *         sess_tearing_down so no more commands are queued.
+ * @se_sess:   session to flag
  */
-void target_splice_sess_cmd_list(struct se_session *se_sess)
+void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
 {
        struct se_cmd *se_cmd;
        unsigned long flags;
 
-       WARN_ON(!list_empty(&se_sess->sess_wait_list));
-       INIT_LIST_HEAD(&se_sess->sess_wait_list);
-
        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
-       se_sess->sess_tearing_down = 1;
 
-       list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
+       WARN_ON(se_sess->sess_tearing_down);
+       se_sess->sess_tearing_down = 1;
 
-       list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
+       list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
                se_cmd->cmd_wait_set = 1;
 
        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
 }
-EXPORT_SYMBOL(target_splice_sess_cmd_list);
+EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
 
 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
  * @se_sess:    session to wait for active I/O
@@ -2513,7 +2511,7 @@ void target_wait_for_sess_cmds(
        bool rc = false;
 
        list_for_each_entry_safe(se_cmd, tmp_cmd,
-                               &se_sess->sess_wait_list, se_cmd_list) {
+                               &se_sess->sess_cmd_list, se_cmd_list) {
                list_del(&se_cmd->se_cmd_list);
 
                pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 4f4f042..fa83ea1 100644 (file)
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -613,7 +613,6 @@ struct se_session {
        struct list_head        sess_list;
        struct list_head        sess_acl_list;
        struct list_head        sess_cmd_list;
-       struct list_head        sess_wait_list;
        spinlock_t              sess_cmd_lock;
        struct kref             sess_kref;
 };

diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 2eba240..815e064 100644 (file)
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -122,7 +122,7 @@ int transport_check_aborted_status(struct se_cmd *, int);
 int    transport_send_check_condition_and_sense(struct se_cmd *, u8, int);
 
 int    target_put_sess_cmd(struct se_session *, struct se_cmd *);
-void   target_splice_sess_cmd_list(struct se_session *);
+void   target_sess_cmd_list_set_waiting(struct se_session *);
 void   target_wait_for_sess_cmds(struct se_session *, int);
 
 int    core_alua_check_nonop_delay(struct se_cmd *);