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authorRusty Russell <rusty@rustcorp.com.au>2007-07-15 23:42:00 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:52 -0700
commitc80e7a826c10cf5bce8487fbaede48bd0bd48d08 (patch)
tree90a8f4dd0c936eacab217a183a9ff311ad259a32
parent5e70030d4cf91613530a23b40ad9919bb9ee114f (diff)
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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 <rusty@rustcorp.com.au> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mempool.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mempool.c b/mm/mempool.c
index cc1ca86dfc2..3e8f1fed0e1 100644
--- 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);