[dpdk-dev] [PATCH v2] common/mlx5: fix uninitialized variable warning

[Slava Ovsiienko]

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Stephen Hemminger
> Sent: Thursday, April 23, 2020 1:32
> To: dev at dpdk.org
> Cc: Stephen Hemminger <stephen at networkplumber.org>; Matan Azrad
> <matan at mellanox.com>
> Subject: [dpdk-dev] [PATCH v2] common/mlx5: fix uninitialized variable
> warning
> 
> Gcc 8.3.0 (Debian 10) complains about unitilized variable.
> 
> [474/2122] Compiling C object
> 'drivers/a715181@@tmp_rte_common_mlx5 at sta/common_mlx5_mlx5_nl.
> c.o'.
> In file included from ../drivers/common/mlx5/mlx5_nl.h:12,
>                  from ../drivers/common/mlx5/mlx5_nl.c:23:
> ../drivers/common/mlx5/mlx5_nl.c: In function ‘mlx5_nl_enable_roce_get’:
> ../drivers/common/mlx5/mlx5_common.h:68:2: warning: ‘cur_en’ may be
> used uninitialized in this function [-Wmaybe-uninitialized]
>   rte_log(RTE_LOG_ ## level, \
>   ^~~~~~~
> ../drivers/common/mlx5/mlx5_nl.c:1560:6: note: ‘cur_en’ was declared here
>   int cur_en;
>       ^~~~~~
> 
> The compiler is correct, this variable would only be set if kernel netlink
> response message contains the DEVLINK parameter that flags if ROCE is
> enabled.
> 
> Fixes: fa69eaef5f49 ("common/mlx5: support ROCE disable through Netlink")
> Cc: matan at mellanox.com
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
Acked-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>

> ---
> v2 - add DCO
> 
>  drivers/common/mlx5/mlx5_nl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/common/mlx5/mlx5_nl.c
> b/drivers/common/mlx5/mlx5_nl.c index 847e78dbcea6..c6014c3ee0b3
> 100644
> --- a/drivers/common/mlx5/mlx5_nl.c
> +++ b/drivers/common/mlx5/mlx5_nl.c
> @@ -1557,7 +1557,7 @@ mlx5_nl_enable_roce_get(int nlsk_fd, int
> family_id, const char *pci_addr,
>  	struct genlmsghdr *genl;
>  	uint32_t sn = MLX5_NL_SN_GENERATE;
>  	int ret;
> -	int cur_en;
> +	int cur_en = 0;
>  	uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
>  		    NLMSG_ALIGN(sizeof(struct genlmsghdr)) +
>  		    NLMSG_ALIGN(sizeof(struct nlattr)) * 4 +
> --
> 2.20.1