linux-kernel - Re: [PATCH net-next 1/6] bnxt_en: Check devlink allocation and registration status

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Date:   Fri, 24 Sep 2021 02:11:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Edwin Peer <edwin.peer@...adcom.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Lobakin <alobakin@...me>,
        Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>,
        Ariel Elior <aelior@...vell.com>,
        GR-everest-linux-l2@...vell.com,
        GR-QLogic-Storage-Upstream@...vell.com,
        Igor Russkikh <irusskikh@...vell.com>,
        intel-wired-lan@...ts.osuosl.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Javed Hasan <jhasan@...vell.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jiri Pirko <jiri@...dia.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-scsi@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Michal Kalderon <michal.kalderon@...vell.com>,
        netdev <netdev@...r.kernel.org>,
        Sathya Perla <sathya.perla@...adcom.com>,
        Saurav Kashyap <skashyap@...vell.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Subject: Re: [PATCH net-next 1/6] bnxt_en: Check devlink allocation and
 registration status

On Thu, Sep 23, 2021 at 02:11:40PM -0700, Edwin Peer wrote:
> On Thu, Sep 23, 2021 at 11:13 AM Leon Romanovsky <leon@...nel.org> wrote:
> >
> > From: Leon Romanovsky <leonro@...dia.com>
> >
> > devlink is a software interface that doesn't depend on any hardware
> > capabilities. The failure in SW means memory issues, wrong parameters,
> > programmer error e.t.c.
> >
> > Like any other such interface in the kernel, the returned status of
> > devlink APIs should be checked and propagated further and not ignored.
> >
> > Fixes: 4ab0c6a8ffd7 ("bnxt_en: add support to enable VF-representors")
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  drivers/net/ethernet/broadcom/bnxt/bnxt.c         |  5 ++++-
> >  drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c | 13 ++++++-------
> >  drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h | 13 -------------
> >  3 files changed, 10 insertions(+), 21 deletions(-)

<...>

> > @@ -835,9 +837,6 @@ void bnxt_dl_unregister(struct bnxt *bp)
> >  {
> >         struct devlink *dl = bp->dl;
> >
> > -       if (!dl)
> > -               return;
> > -
> 
> minor nit: There's obviously nothing incorrect about doing this (and
> adding the additional error label in the cleanup code above), but bnxt
> has generally adopted a style of having cleanup functions being
> idempotent. It generally makes error handling simpler and less error
> prone.

I would argue that opposite is true. Such "impossible" checks hide unwind
flow errors, missing releases e.t.c.

<...>

> >
> 
> Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>

Thanks for the review.


> 
> Regards,
> Edwin Peer