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devlink: ignore -EOPNOTSUPP errors on dumpit

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Number of .dumpit functions try to ignore -EOPNOTSUPP errors.
Recent change missed that, and started reporting all errors
but -EMSGSIZE back from dumps. This leads to situation like
this:

$ devlink dev info
devlink answers: Operation not supported

Dump should not report an error just because the last device
to be queried could not provide an answer.

To fix this and avoid similar confusion make sure we clear
err properly, and not leave it set to an error if we don't
terminate the iteration.

Fixes: c62c2cfb80 ("net: devlink: don't ignore errors during dumpit")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2020-07-28 16:15:07 -07:00 committed by David S. Miller
parent 65550098c1
commit 82274d0755
1 changed files with 18 additions and 6 deletions
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24
net/core/devlink.c
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@ -1065,7 +1065,9 @@ static int devlink_nl_cmd_sb_pool_get_dumpit(struct sk_buff *msg,
devlink_sb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq);
if (err && err != -EOPNOTSUPP) {
if (err == -EOPNOTSUPP) {
err = 0;
} else if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
@ -1266,7 +1268,9 @@ static int devlink_nl_cmd_sb_port_pool_get_dumpit(struct sk_buff *msg,
devlink, devlink_sb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq);
if (err && err != -EOPNOTSUPP) {
if (err == -EOPNOTSUPP) {
err = 0;
} else if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
@ -1498,7 +1502,9 @@ devlink_nl_cmd_sb_tc_pool_bind_get_dumpit(struct sk_buff *msg,
devlink_sb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq);
if (err && err != -EOPNOTSUPP) {
if (err == -EOPNOTSUPP) {
err = 0;
} else if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
@ -3299,7 +3305,9 @@ static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI);
if (err && err != -EOPNOTSUPP) {
if (err == -EOPNOTSUPP) {
err = 0;
} else if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
@ -3569,7 +3577,9 @@ static int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI);
if (err && err != -EOPNOTSUPP) {
if (err == -EOPNOTSUPP) {
err = 0;
} else if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
@ -4518,7 +4528,9 @@ static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
cb->extack);
mutex_unlock(&devlink->lock);
if (err && err != -EOPNOTSUPP)
if (err == -EOPNOTSUPP)
err = 0;
else if (err)
break;
idx++;
}