1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index c7619716c31d..59040265e361 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -64,6 +64,14 @@ enum {
 #define GUID_TBL_BLK_NUM_ENTRIES 8
 #define GUID_TBL_BLK_SIZE (GUID_TBL_ENTRY_SIZE * GUID_TBL_BLK_NUM_ENTRIES)
 
+/* Counters should be saturate once they reach their maximum value */
+#define ASSIGN_32BIT_COUNTER(counter, value) do {\
+        if ((value) > U32_MAX)                   \
+                counter = cpu_to_be32(U32_MAX); \
+        else                                     \
+                counter = cpu_to_be32(value);    \
+} while (0)
+
 struct mlx4_mad_rcv_buf {
         struct ib_grh grh;
         u8 payload[256];
@@ -806,10 +814,14 @@ static int ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 static void edit_counter(struct mlx4_counter *cnt,
                                         struct ib_pma_portcounters *pma_cnt)
 {
-        pma_cnt->port_xmit_data = cpu_to_be32((be64_to_cpu(cnt->tx_bytes)>>2));
-        pma_cnt->port_rcv_data  = cpu_to_be32((be64_to_cpu(cnt->rx_bytes)>>2));
-        pma_cnt->port_xmit_packets = cpu_to_be32(be64_to_cpu(cnt->tx_frames));
-        pma_cnt->port_rcv_packets  = cpu_to_be32(be64_to_cpu(cnt->rx_frames));
+        ASSIGN_32BIT_COUNTER(pma_cnt->port_xmit_data,
+                             (be64_to_cpu(cnt->tx_bytes) >> 2));
+        ASSIGN_32BIT_COUNTER(pma_cnt->port_rcv_data,
+                             (be64_to_cpu(cnt->rx_bytes) >> 2));
+        ASSIGN_32BIT_COUNTER(pma_cnt->port_xmit_packets,
+                             be64_to_cpu(cnt->tx_frames));
+        ASSIGN_32BIT_COUNTER(pma_cnt->port_rcv_packets,
+                             be64_to_cpu(cnt->rx_frames));
 }
 
 static int iboe_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,