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bonding: check slave set command firstly

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This patch is a little improvement. If user use the
command shown as below, we should print the info [1]
instead of [2]. The eth0 exists actually, and it may
confuse user.

$ echo "eth0" > /sys/class/net/bond4/bonding/slaves

[1] "bond4: no command found in slaves file - use +ifname or -ifname"
[2] "write error: No such device"

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tonghao Zhang 2019-02-11 10:49:48 -08:00 committed by David S. Miller
parent 79e088239c
commit 415d394273
1 changed files with 2 additions and 0 deletions
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2
drivers/net/bonding/bond_options.c
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@ -1375,6 +1375,7 @@ static int bond_option_slaves_set(struct bonding *bond,
sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
if ((strlen(command) <= 1) ||
(command[0] != '+' && command[0] != '-') ||
!dev_valid_name(ifname))
goto err_no_cmd;
@ -1398,6 +1399,7 @@ static int bond_option_slaves_set(struct bonding *bond,
break;
default:
/* should not run here. */
goto err_no_cmd;
}