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percpu: fix locking regression in the failure path of pcpu_alloc()

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While updating locking, b38d08f318 ("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>
This commit is contained in:
Tejun Heo 2014-09-09 08:02:45 +09:00
parent a34375ef9e
commit 23cb8981ed
1 changed files with 1 additions and 0 deletions
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mm/percpu.c
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@ -974,6 +974,7 @@ restart:
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;
}