path: root/lib
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authorHiroaki SHIMODA <shimoda.hiroaki@gmail.com>2012-05-30 12:24:39 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-31 18:18:16 -0400
commit0cfd32b736ae0c36b42697584811042726c07cba (patch)
tree1e667905d1a668206875db4dc5eeb6d72a7c299d /lib
parent401453a31ea8192eb94f9337f5608de907681bfb (diff)
bql: Fix POSDIFF() to integer overflow aware.
POSDIFF() fails to take into account integer overflow case. Signed-off-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com> Cc: Tom Herbert <therbert@google.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Denys Fedoryshchenko <denys@visp.net.lb> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dynamic_queue_limits.c b/lib/dynamic_queue_limits.c
index 6ab4587d052..c87eb76f2fd 100644
--- a/lib/dynamic_queue_limits.c
+++ b/lib/dynamic_queue_limits.c
@@ -10,7 +10,7 @@
#include <linux/jiffies.h>
#include <linux/dynamic_queue_limits.h>
-#define POSDIFF(A, B) ((A) > (B) ? (A) - (B) : 0)
+#define POSDIFF(A, B) ((int)((A) - (B)) > 0 ? (A) - (B) : 0)
/* Records completed count and recalculates the queue limit */
void dql_completed(struct dql *dql, unsigned int count)