net/mlx5: allocate device list explicitly

At device probing the device list to spawn was allocated
as dynamic size local variable. It was no possible to have
one unified exit point from routine due to compiler warnings.
This patch allocates the spawn device list directly with
rte_zmalloc() and it is possible to goto to unified exit
label from anywhere of the routine.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index dcb22b2..be3fb2a 100644 (file)
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -2153,6 +2153,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
         * Actually this is the number of iterations to spawn.
         */
        unsigned int ns = 0;
+       struct mlx5_dev_spawn_data *list = NULL;
        struct mlx5_dev_config dev_config;
        int ret;
 
@@ -2175,8 +2176,8 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
         * matching ones, gathering into the list.
         */
        struct ibv_device *ibv_match[ret + 1];
-       int nl_route = -1;
-       int nl_rdma = -1;
+       int nl_route = mlx5_nl_init(NETLINK_ROUTE);
+       int nl_rdma = mlx5_nl_init(NETLINK_RDMA);
        unsigned int i;
 
        while (ret-- > 0) {
@@ -2198,7 +2199,6 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
        ibv_match[nd] = NULL;
        if (!nd) {
                /* No device matches, just complain and bail out. */
-               mlx5_glue->free_device_list(ibv_list);
                DRV_LOG(WARNING,
                        "no Verbs device matches PCI device " PCI_PRI_FMT ","
                        " are kernel drivers loaded?",
@@ -2206,10 +2206,8 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
                        pci_dev->addr.devid, pci_dev->addr.function);
                rte_errno = ENOENT;
                ret = -rte_errno;
-               return ret;
+               goto exit;
        }
-       nl_route = mlx5_nl_init(NETLINK_ROUTE);
-       nl_rdma = mlx5_nl_init(NETLINK_RDMA);
        if (nd == 1) {
                /*
                 * Found single matching device may have multiple ports.
@@ -2226,8 +2224,16 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
         * Now we can determine the maximal
         * amount of devices to be spawned.
         */
-       struct mlx5_dev_spawn_data list[np ? np : nd];
-
+       list = rte_zmalloc("device spawn data",
+                        sizeof(struct mlx5_dev_spawn_data) *
+                        (np ? np : nd),
+                        RTE_CACHE_LINE_SIZE);
+       if (!list) {
+               DRV_LOG(ERR, "spawn data array allocation failure");
+               rte_errno = ENOMEM;
+               ret = -rte_errno;
+               goto exit;
+       }
        if (np > 1) {
                /*
                 * Single IB device with multiple ports found,
@@ -2476,12 +2482,15 @@ exit:
        /*
         * Do the routine cleanup:
         * - close opened Netlink sockets
+        * - free allocated spawn data array
         * - free the Infiniband device list
         */
        if (nl_rdma >= 0)
                close(nl_rdma);
        if (nl_route >= 0)
                close(nl_route);
+       if (list)
+               rte_free(list);
        assert(ibv_list);
        mlx5_glue->free_device_list(ibv_list);
        return ret;