percpu: fix locking regression in the failure path of pcpu_alloc()
While updating locking, b38d08f3181c ("percpu: restructure locking")
broke pcpu_create_chunk() creation path in pcpu_alloc(). It returns
without releasing pcpu_alloc_mutex. Fix it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
diff --git a/mm/percpu.c b/mm/percpu.c
index 867efd3..af3dd27 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -974,6 +974,7 @@
if (list_empty(&pcpu_slot[pcpu_nr_slots - 1])) {
chunk = pcpu_create_chunk();
if (!chunk) {
+ mutex_unlock(&pcpu_alloc_mutex);
err = "failed to allocate new chunk";
goto fail;
}