stack: reload head when pop fails (generic)
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Commit Message
The previous fix 18effad9cfa7 ("stack: reload head when pop fails") only
changed C11 implementation, not generic implementation.
List head must be loaded right before continue (when failed to find the
new head). Without this, one thread might keep trying and failing to pop
items without ever loading the new correct head.
Fixes: 3340202f5954 ("stack: add lock-free implementation")
Cc: gage.eads@intel.com
Cc: stable@dpdk.org
Signed-off-by: Julien Meunier <julien.meunier@nokia.com>
---
lib/stack/rte_stack_lf_generic.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
@@ -128,8 +128,10 @@ __rte_stack_lf_pop_elems(struct rte_stack_lf_list *list,
/* If NULL was encountered, the list was modified while
* traversing it. Retry.
*/
- if (i != num)
+ if (i != num) {
+ old_head = list->head;
continue;
+ }
new_head.top = tmp;
new_head.cnt = old_head.cnt + 1;