net/mlx5: fix an uninitialized variable

Since patch "mbuf: structure reorganization" the compiler complains
sometimes (in some conditions):

 .../drivers/net/mlx5/mlx5_rxtx.c: In function ‘mlx5_rx_burst’:
 .../drivers/net/mlx5/mlx5_rxtx.c:2082:17: error: ‘len’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]

len is not initialised as it will be at the first segment of a received
packet, but it remains hard for the compiler to determine it.

Fixes: 9964b965ad69 ("net/mlx5: re-add Rx scatter support")
Cc: stable@dpdk.org
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 06b699a..fae9d27 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -1972,7 +1972,7 @@ mlx5_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
                &(*rxq->cqes)[rxq->cq_ci & cqe_cnt];
        unsigned int i = 0;
        unsigned int rq_ci = rxq->rq_ci << sges_n;
-       int len; /* keep its value across iterations. */
+       int len = 0; /* keep its value across iterations. */
 
        while (pkts_n) {
                unsigned int idx = rq_ci & wqe_cnt;