netdev - Re: [patch net-next] team: do not use -ENOENT

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Date:	Thu, 17 Jan 2013 21:33:47 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [patch net-next] team: do not use -ENOENT

Thu, Jan 17, 2013 at 04:51:15PM CET, stephen@...workplumber.org wrote:
>On Thu, 17 Jan 2013 11:25:00 +0100
>Jiri Pirko <jiri@...nulli.us> wrote:
>
>> Since this error code means "No such file or directory", change this
>> value in team driver to ones which make more sense.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  drivers/net/team/team.c                   | 4 ++--
>>  drivers/net/team/team_mode_activebackup.c | 2 +-
>>  2 files changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
>> index 70d5d6b..3d7cf6e 100644
>> --- a/drivers/net/team/team.c
>> +++ b/drivers/net/team/team.c
>> @@ -1128,7 +1128,7 @@ static int team_port_del(struct team *team, struct net_device *port_dev)
>>  	if (!port || !team_port_find(team, port)) {
>>  		netdev_err(dev, "Device %s does not act as a port of this team\n",
>>  			   portname);
>> -		return -ENOENT;
>> +		return -ENODEV;
>>  	}
>>  
>>  	__team_option_inst_mark_removed_port(team, port);
>> @@ -2320,7 +2320,7 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
>>  			list_add(&opt_inst->tmp_list, &opt_inst_list);
>>  		}
>>  		if (!opt_found) {
>> -			err = -ENOENT;
>> +			err = -EINVAL;
>>  			goto team_put;
>>  		}
>>  	}
>> diff --git a/drivers/net/team/team_mode_activebackup.c b/drivers/net/team/team_mode_activebackup.c
>> index 6262b4d..2792e13 100644
>> --- a/drivers/net/team/team_mode_activebackup.c
>> +++ b/drivers/net/team/team_mode_activebackup.c
>> @@ -81,7 +81,7 @@ static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
>>  			return 0;
>>  		}
>>  	}
>> -	return -ENOENT;
>> +	return -ENODEV;
>>  }
>>  
>>  static const struct team_option ab_options[] = {
>
>To be pedantic.
>Changing errno's means effectively changing the ABI.
>Linus has already rejected similar patches in other areas.

I'm not really sure. But in this case, I do not think that is a problem.

1) I'm most probably the only one (libteam) who is using this api and
libteam does not mind about what err code is returned in these cases.

2) In this case, it is only about different number. And one number or
another, it does not imply userspace to behave differently. In other words,
userspace should not take different actions in case for example -ENOENT
or -ENODEV is returned.

But as I said, I'm not sure.

Thanks

Jiri
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