From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>,
stable@dpdk.org, Dariusz Sosnowski <dsosnowski@nvidia.com>,
Viacheslav Ovsiienko <viacheslavo@nvidia.com>,
Bing Zhao <bingz@nvidia.com>, Ori Kam <orika@nvidia.com>,
Suanming Mou <suanmingm@nvidia.com>,
Matan Azrad <matan@nvidia.com>, Ophir Munk <ophirmu@nvidia.com>
Subject: [PATCH] net/mlx5: fix uninitialized warning
Date: Thu, 13 Nov 2025 08:33:01 -0800 [thread overview]
Message-ID: <20251113163301.285550-1-stephen@networkplumber.org> (raw)
Gcc-16 detects use of uninitialized variable.
./drivers/net/mlx5/linux/mlx5_ethdev_os.c: In function ‘mlx5_link_update’:
../drivers/net/mlx5/linux/mlx5_ethdev_os.c:539:15: warning: ‘*(long unsigned int *)((char *)&dev_link + offsetof(struct rte_eth_link, <U38c0>))’ may be used uninitialized [-Wmaybe-uninitialized]
539 | ret = !!memcmp(&dev->data->dev_link, &dev_link,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
540 | sizeof(struct rte_eth_link));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/mlx5/linux/mlx5_ethdev_os.c:515:29: note: ‘*(long unsigned int *)((char *)&dev_link + offsetof(struct rte_eth_link, <U38c0>))’ was declared here
515 | struct rte_eth_link dev_link;
|
If the retry loop exits the code would do memcmp against unintialized
stack value. Resolve by intializing to zero.
Fixes: 1256805dd54d ("net/mlx5: move Linux-specific functions")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
drivers/net/mlx5/linux/mlx5_ethdev_os.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/mlx5/linux/mlx5_ethdev_os.c b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
index 4d8fbed188..d4a544e1a6 100644
--- a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
+++ b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
@@ -512,7 +512,7 @@ int
mlx5_link_update(struct rte_eth_dev *dev, int wait_to_complete)
{
int ret;
- struct rte_eth_link dev_link;
+ struct rte_eth_link dev_link = { };
time_t start_time = time(NULL);
int retry = MLX5_GET_LINK_STATUS_RETRY_COUNT;
--
2.51.0
next reply other threads:[~2025-11-13 16:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 16:33 Stephen Hemminger [this message]
2025-11-13 17:50 ` Stephen Hemminger
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