[PATCH v2 2/7] tailq: skip init if already initialized

[okaya]

From: Sinan Kaya <ok...@kernel.org>

Allows tailq to be reinitialied multiple times
by looking up previously registered tailqs

Signed-off-by: Sinan Kaya <ok...@kernel.org>
---
 lib/eal/common/eal_common_tailqs.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/lib/eal/common/eal_common_tailqs.c 
b/lib/eal/common/eal_common_tailqs.c
index 580fbf24bc..75c0235438 100644
--- a/lib/eal/common/eal_common_tailqs.c
+++ b/lib/eal/common/eal_common_tailqs.c
@@ -73,9 +73,10 @@ rte_eal_tailq_create(const char *name)
                strlcpy(head->name, name, sizeof(head->name) - 1);
                TAILQ_INIT(&head->tailq_head);
                rte_tailqs_count++;
+               return head;
        }
 
-       return head;
+       return rte_eal_tailq_lookup(name);
 }
 
 /* local register, used to store "early" tailqs before rte_eal_init() and to
@@ -99,7 +100,9 @@ rte_eal_tailq_update(struct rte_tailq_elem *t)
 {
        if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
                /* primary process is the only one that creates */
-               t->head = rte_eal_tailq_create(t->name);
+               t->head = rte_eal_tailq_lookup(t->name);
+               if (t->head == NULL)
+                       t->head = rte_eal_tailq_create(t->name);
        } else {
                t->head = rte_eal_tailq_lookup(t->name);
        }
@@ -108,15 +111,13 @@ rte_eal_tailq_update(struct rte_tailq_elem *t)
 int
 rte_eal_tailq_register(struct rte_tailq_elem *t)
 {
-       if (rte_eal_tailq_local_register(t) < 0) {
-               RTE_LOG(ERR, EAL,
-                       "%s tailq is already registered\n", t->name);
-               goto error;
-       }
+       rte_eal_tailq_local_register(t);
 
        /* if a register happens after rte_eal_tailqs_init(), then we can update
         * tailq head */
        if (rte_tailqs_count >= 0) {
+               RTE_LOG(INFO, EAL,
+                       "%s tailq is registered\n", t->name);
                rte_eal_tailq_update(t);
                if (t->head == NULL) {
                        RTE_LOG(ERR, EAL,
@@ -138,6 +139,11 @@ rte_eal_tailqs_init(void)
 {
        struct rte_tailq_elem *t;
 
+       if (rte_tailqs_count > 0) {
+               RTE_LOG(INFO, EAL, "tailq already initialized\n");
+               return 0;
+       }
+
        rte_tailqs_count = 0;
 
        TAILQ_FOREACH(t, &rte_tailq_elem_head, next) {
-- 
2.25.1