lib: percpu_counter_init error handling

alloc_percpu can fail, propagate that error.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 3b0ed80c1efd..3a59d84b2d1e 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -68,21 +68,27 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
 }
 EXPORT_SYMBOL(__percpu_counter_sum);
 
-void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
+int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
 {
         spin_lock_init(&fbc->lock);
         fbc->count = amount;
         fbc->counters = alloc_percpu(s32);
+        if (!fbc->counters)
+                return -ENOMEM;
 #ifdef CONFIG_HOTPLUG_CPU
         mutex_lock(&percpu_counters_lock);
         list_add(&fbc->list, &percpu_counters);
         mutex_unlock(&percpu_counters_lock);
 #endif
+        return 0;
 }
 EXPORT_SYMBOL(percpu_counter_init);
 
 void percpu_counter_destroy(struct percpu_counter *fbc)
 {
+        if (!fbc->counters)
+                return;
+
         free_percpu(fbc->counters);
 #ifdef CONFIG_HOTPLUG_CPU
         mutex_lock(&percpu_counters_lock);