permit mempool_free(NULL)

Christian Borntraeger points out that mempool_free() doesn't noop when handed NULL. This is inconsistent with the other free-like functions in the kernel. Signed-off-by: Rusty Russell <[email protected]> Cc: Christian Borntraeger <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
seken · Jul 16, 2007 · c80e7a8 · c80e7a8
1 parent 5e70030
commit c80e7a8
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/mm/mempool.c b/mm/mempool.c
@@ -263,6 +263,9 @@ void mempool_free(void *element, mempool_t *pool)
 {
 	unsigned long flags;
 
+	if (unlikely(element == NULL))
+		return;
+
 	smp_mb();
 	if (pool->curr_nr < pool->min_nr) {
 		spin_lock_irqsave(&pool->lock, flags);