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[dpdk-dev,v3,22/25] mlx5: work around spurious compilation errors

Message ID 1466493818-1877-23-git-send-email-nelio.laranjeiro@6wind.com (mailing list archive)
State Superseded, archived
Delegated to: Bruce Richardson
Headers

Commit Message

Nélio Laranjeiro June 21, 2016, 7:23 a.m. UTC 
  From: Adrien Mazarguil <adrien.mazarguil@6wind.com>

Since commit "mlx5: resurrect Tx gather support", older GCC versions (such
as 4.8.5) may complain about the following:

 mlx5_rxtx.c: In function `mlx5_tx_burst':
 mlx5_rxtx.c:705:25: error: `wqe' may be used uninitialized in this
     function [-Werror=maybe-uninitialized]

 mlx5_rxtx.c: In function `mlx5_tx_burst_inline':
 mlx5_rxtx.c:864:25: error: `wqe' may be used uninitialized in this
     function [-Werror=maybe-uninitialized]

In both cases, this code cannot be reached when wqe is not initialized.

Considering older GCC versions are still widely used, work around this
issue by initializing wqe preemptively, even if it should not be necessary.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index db784c0..2fc57dc 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -591,7 +591,7 @@  mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 	unsigned int j = 0;
 	unsigned int max;
 	unsigned int comp;
-	volatile union mlx5_wqe *wqe;
+	volatile union mlx5_wqe *wqe = NULL;
 
 	if (unlikely(!pkts_n))
 		return 0;
@@ -733,7 +733,7 @@  mlx5_tx_burst_inline(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 	unsigned int j = 0;
 	unsigned int max;
 	unsigned int comp;
-	volatile union mlx5_wqe *wqe;
+	volatile union mlx5_wqe *wqe = NULL;
 	unsigned int max_inline = txq->max_inline;
 
 	if (unlikely(!pkts_n))