1 files changed, 3 insertions, 2 deletions

diff --git a/net/ieee80211/ieee80211_crypt_ccmp.c b/net/ieee80211/ieee80211_crypt_ccmp.c
index b016b4104de6..2e6b099fc84c 100644
--- a/net/ieee80211/ieee80211_crypt_ccmp.c
+++ b/net/ieee80211/ieee80211_crypt_ccmp.c
@@ -9,6 +9,7 @@
  * more details.
  */
 
+#include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -241,7 +242,7 @@ static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
         hdr = (struct ieee80211_hdr_4addr *)skb->data;
         ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0);
 
-        blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN;
+        blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
         last = data_len % AES_BLOCK_LEN;
 
         for (i = 1; i <= blocks; i++) {
@@ -351,7 +352,7 @@ static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
         ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b);
         xor_block(mic, b, CCMP_MIC_LEN);
 
-        blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN;
+        blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
         last = data_len % AES_BLOCK_LEN;
 
         for (i = 1; i <= blocks; i++) {