1 files changed, 38 insertions, 52 deletions

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 7e6e031cc41b..1a8cd20f484f 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -189,6 +189,7 @@ static void iscsi_complete_command(struct iscsi_session *session,
 {
         struct scsi_cmnd *sc = ctask->sc;
 
+        ctask->state = ISCSI_TASK_COMPLETED;
         ctask->sc = NULL;
         list_del_init(&ctask->running);
         __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
@@ -568,20 +569,24 @@ static int iscsi_data_xmit(struct iscsi_conn *conn)
         }
 
         /* process command queue */
-        while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
-                           sizeof(void*))) {
+        spin_lock_bh(&conn->session->lock);
+        while (!list_empty(&conn->xmitqueue)) {
                 /*
                  * iscsi tcp may readd the task to the xmitqueue to send
                  * write data
                  */
-                spin_lock_bh(&conn->session->lock);
-                if (list_empty(&conn->ctask->running))
-                        list_add_tail(&conn->ctask->running, &conn->run_list);
+                conn->ctask = list_entry(conn->xmitqueue.next,
+                                         struct iscsi_cmd_task, running);
+                conn->ctask->state = ISCSI_TASK_RUNNING;
+                list_move_tail(conn->xmitqueue.next, &conn->run_list);
                 spin_unlock_bh(&conn->session->lock);
+
                 rc = tt->xmit_cmd_task(conn, conn->ctask);
                 if (rc)
                         goto again;
+                spin_lock_bh(&conn->session->lock);
         }
+        spin_unlock_bh(&conn->session->lock);
         /* done with this ctask */
         conn->ctask = NULL;
 
@@ -691,6 +696,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
         sc->SCp.phase = session->age;
         sc->SCp.ptr = (char *)ctask;
 
+        ctask->state = ISCSI_TASK_PENDING;
         ctask->mtask = NULL;
         ctask->conn = conn;
         ctask->sc = sc;
@@ -700,7 +706,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 
         session->tt->init_cmd_task(ctask);
 
-        __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
+        list_add_tail(&ctask->running, &conn->xmitqueue);
         debug_scsi(
                "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
                 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
@@ -977,31 +983,27 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
 /*
  * xmit mutex and session lock must be held
  */
-#define iscsi_remove_task(tasktype)                                     \
-static struct iscsi_##tasktype *                                        \
-iscsi_remove_##tasktype(struct kfifo *fifo, uint32_t itt)               \
-{                                                                       \
-        int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);            \
-        struct iscsi_##tasktype *task;                                  \
-                                                                        \
-        debug_scsi("searching %d tasks\n", nr_tasks);                   \
-                                                                        \
-        for (i = 0; i < nr_tasks; i++) {                                \
-                __kfifo_get(fifo, (void*)&task, sizeof(void*));         \
-                debug_scsi("check task %u\n", task->itt);               \
-                                                                        \
-                if (task->itt == itt) {                                 \
-                        debug_scsi("matched task\n");                   \
-                        return task;                                    \
-                }                                                       \
-                                                                        \
-                __kfifo_put(fifo, (void*)&task, sizeof(void*));         \
-        }                                                               \
-        return NULL;                                                    \
-}
+static struct iscsi_mgmt_task *
+iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
+{
+        int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
+        struct iscsi_mgmt_task *task;
+
+        debug_scsi("searching %d tasks\n", nr_tasks);
+
+        for (i = 0; i < nr_tasks; i++) {
+                __kfifo_get(fifo, (void*)&task, sizeof(void*));
+                debug_scsi("check task %u\n", task->itt);
+
+                if (task->itt == itt) {
+                        debug_scsi("matched task\n");
+                        return task;
+                }
 
-iscsi_remove_task(mgmt_task);
-iscsi_remove_task(cmd_task);
+                __kfifo_put(fifo, (void*)&task, sizeof(void*));
+        }
+        return NULL;
+}
 
 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
 {
@@ -1043,7 +1045,6 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
         struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
         struct iscsi_conn *conn = ctask->conn;
         struct iscsi_session *session = conn->session;
-        struct iscsi_cmd_task *pending_ctask;
         int rc;
 
         conn->eh_abort_cnt++;
@@ -1071,17 +1072,8 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
                 goto failed;
         }
 
-        /* check for the easy pending cmd abort */
-        pending_ctask = iscsi_remove_cmd_task(conn->xmitqueue, ctask->itt);
-        if (pending_ctask) {
-                /* iscsi_tcp queues write transfers on the xmitqueue */
-                if (list_empty(&pending_ctask->running)) {
-                        debug_scsi("found pending task\n");
-                        goto success;
-                } else
-                        __kfifo_put(conn->xmitqueue, (void*)&pending_ctask,
-                                    sizeof(void*));
-        }
+        if (ctask->state == ISCSI_TASK_PENDING)
+                goto success;
 
         conn->tmabort_state = TMABORT_INITIAL;
 
@@ -1263,6 +1255,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 if (cmd_task_size)
                         ctask->dd_data = &ctask[1];
                 ctask->itt = cmd_i;
+                INIT_LIST_HEAD(&ctask->running);
         }
 
         spin_lock_init(&session->lock);
@@ -1282,6 +1275,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 if (mgmt_task_size)
                         mtask->dd_data = &mtask[1];
                 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
+                INIT_LIST_HEAD(&mtask->running);
         }
 
         if (scsi_add_host(shost, NULL))
@@ -1361,12 +1355,7 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
         conn->tmabort_state = TMABORT_INITIAL;
         INIT_LIST_HEAD(&conn->run_list);
         INIT_LIST_HEAD(&conn->mgmt_run_list);
-
-        /* initialize general xmit PDU commands queue */
-        conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
-                                        GFP_KERNEL, NULL);
-        if (conn->xmitqueue == ERR_PTR(-ENOMEM))
-                goto xmitqueue_alloc_fail;
+        INIT_LIST_HEAD(&conn->xmitqueue);
 
         /* initialize general immediate & non-immediate PDU commands queue */
         conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
@@ -1410,8 +1399,6 @@ login_mtask_alloc_fail:
 mgmtqueue_alloc_fail:
         kfifo_free(conn->immqueue);
 immqueue_alloc_fail:
-        kfifo_free(conn->xmitqueue);
-xmitqueue_alloc_fail:
         iscsi_destroy_conn(cls_conn);
         return NULL;
 }
@@ -1489,7 +1476,6 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
                 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
         spin_unlock_bh(&session->lock);
 
-        kfifo_free(conn->xmitqueue);
         kfifo_free(conn->immqueue);
         kfifo_free(conn->mgmtqueue);
 
@@ -1572,7 +1558,7 @@ static void fail_all_commands(struct iscsi_conn *conn)
         struct iscsi_cmd_task *ctask, *tmp;
 
         /* flush pending */
-        while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) {
+        list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
                 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
                            ctask->itt);
                 fail_command(conn, ctask, DID_BUS_BUSY << 16);