netdev - Re: [patch net-next v2 05/12] mlxsw: core_linecards: Expose HW revision and INI version

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Date:   Wed, 20 Jul 2022 18:01:12 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        petrm@...dia.com, pabeni@...hat.com, edumazet@...gle.com,
        mlxsw@...dia.com, saeedm@...dia.com, snelson@...sando.io
Subject: Re: [patch net-next v2 05/12] mlxsw: core_linecards: Expose HW
 revision and INI version

On Wed, Jul 20, 2022 at 04:59:03PM +0200, Jiri Pirko wrote:
> Wed, Jul 20, 2022 at 02:43:17PM CEST, idosch@...dia.com wrote:
> >On Wed, Jul 20, 2022 at 02:27:40PM +0200, Jiri Pirko wrote:
> >> Wed, Jul 20, 2022 at 10:56:35AM CEST, idosch@...dia.com wrote:
> >> >On Tue, Jul 19, 2022 at 08:48:40AM +0200, Jiri Pirko wrote:
> >> >> +int mlxsw_linecard_devlink_info_get(struct mlxsw_linecard *linecard,
> >> >> +				    struct devlink_info_req *req,
> >> >> +				    struct netlink_ext_ack *extack)
> >> >> +{
> >> >> +	char buf[32];
> >> >> +	int err;
> >> >> +
> >> >> +	mutex_lock(&linecard->lock);
> >> >> +	if (WARN_ON(!linecard->provisioned)) {
> >> >> +		err = 0;
> >> >
> >> >Why not:
> >> >
> >> >err = -EINVAL;
> >> >
> >> >?
> >> 
> >> Well, a) this should not happen. No need to push error to the user for
> >> this as the rest of the info message is still fine.
> >
> >Not sure what you mean by "the rest of the info message is still fine".
> >Which info message? If the line card is not provisioned, then it
> >shouldn't even have a devlink instance and it will not appear in
> >"devlink dev info" dump.
> >
> >I still do not understand why this error is severe enough to print a
> >WARNING to the kernel log, but not emit an error code to user space.
> 
> As I wrote, WARN_ON was a leftover.

It was a leftover in patch #10 where you checked '!linecard->ready'.
Here I think it's actually correct because it shouldn't happen unless
I'm missing something