netdev - Re: [PATCH bpf] bpftool: Fix errno variable usage

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Date:   Thu, 11 Apr 2019 12:22:54 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Benjamin Poirier <bpoirier@...e.com>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH bpf] bpftool: Fix errno variable usage

2019-04-11 17:03 UTC+0900 ~ Benjamin Poirier <bpoirier@...e.com>
> The test meant to use the saved value of errno. Given the current code, it
> makes no practical difference however.
> 
> Fixes: bf598a8f0f77 ("bpftool: Improve handling of ENOENT on map dumps")
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
> ---
>  tools/bpf/bpftool/map.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
> index e0c650d91784..05b029b934a6 100644
> --- a/tools/bpf/bpftool/map.c
> +++ b/tools/bpf/bpftool/map.c
> @@ -720,7 +720,7 @@ static int dump_map_elem(int fd, void *key, void *value,
>  		jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
>  		jsonw_end_object(json_wtr);
>  	} else {
> -		if (errno == ENOENT)
> +		if (lookup_errno == ENOENT)
>  			print_entry_plain(map_info, key, NULL);
>  		else
>  			print_entry_error(map_info, key,
> 


Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>