netdev - Re: [PATCH v2 net] devlink: Fix error handling in param and info

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Date:   Mon, 30 Sep 2019 14:10:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        jiri@...lanox.com
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...lanox.com>,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH v2 net] devlink: Fix error handling in param and info_get
 dumpit cb

On Mon, Sep 30, 2019 at 11:52:21AM +0530, Vasundhara Volam wrote:
> If any of the param or info_get op returns error, dumpit cb is
> skipping to dump remaining params or info_get ops for all the
> drivers.
> 
> Fix to not return if any of the param/info_get op returns error
> as not supported and continue to dump remaining information.
> 
> v2: Modify the patch to return error, except for params/info_get
> op that return -EOPNOTSUPP as suggested by Andrew Lunn. Also, modify
> commit message to reflect the same.
> 
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Jiri Pirko <jiri@...lanox.com>
> Cc: Michael Chan <michael.chan@...adcom.com>
> Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
> ---
>  net/core/devlink.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index e48680e..f80151e 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -3172,7 +3172,7 @@ 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) {
> +			if (err && err != -EOPNOTSUPP) {
>  				mutex_unlock(&devlink->lock);
>  				goto out;
>  			}

and out: is

out:
        mutex_unlock(&devlink_mutex);

        cb->args[0] = idx;
        return msg->len;
}

Jiri: Is the intention really to throw away the error?

Looking at the rest of devlink, all the other _get_dumpit() functions,
except health_reporter_dump_get_dumpit(), do discard any errors.

As for this patch

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew