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authorHiroaki SHIMODA <shimoda.hiroaki@gmail.com>2012-05-30 12:24:39 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 09:03:26 -0700
commit19d07e884b7fd22f92eb8939556dcbf55df1982c (patch)
treee34fb56ca80a59da364b067238a85465caad38c1 /lib
parent8f5b330048b06ca0e2ffa88300922808ebc2b93f (diff)
downloadlwn-19d07e884b7fd22f92eb8939556dcbf55df1982c.tar.gz
lwn-19d07e884b7fd22f92eb8939556dcbf55df1982c.zip
bql: Fix POSDIFF() to integer overflow aware.
[ Upstream commit 0cfd32b736ae0c36b42697584811042726c07cba ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/dynamic_queue_limits.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dynamic_queue_limits.c b/lib/dynamic_queue_limits.c
index 6ab4587d052b..c87eb76f2fd4 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)