netdev - Re: [PATCH wpan-next] mac802154: Avoid superfluous endianness handling

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Message-ID: <CAK-6q+iOXe2CQ=Bc4Ba8vK=M_hTW7cdJ5TormiHy5DJsiyr_BQ@mail.gmail.com>
Date:   Mon, 30 Jan 2023 11:41:20 -0500
From:   Alexander Aring <aahringo@...hat.com>
To:     Stefan Schmidt <stefan@...enfreihafen.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Alexander Aring <alex.aring@...il.com>,
        linux-wpan@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Guilhem Imberton <guilhem.imberton@...vo.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH wpan-next] mac802154: Avoid superfluous endianness handling

Hi,

On Mon, Jan 30, 2023 at 11:34 AM Stefan Schmidt
<stefan@...enfreihafen.org> wrote:
>
> Hello.
>
> On 30.01.23 16:43, Miquel Raynal wrote:
> > When compiling scan.c with C=1, Sparse complains with:
> >
> >     sparse:     expected unsigned short [usertype] val
> >     sparse:     got restricted __le16 [usertype] pan_id
> >     sparse: sparse: cast from restricted __le16
> >
> >     sparse:     expected unsigned long long [usertype] val
> >     sparse:     got restricted __le64 [usertype] extended_addr
> >     sparse: sparse: cast from restricted __le64
> >
> > The tool is right, both pan_id and extended_addr already are rightfully
> > defined as being __le16 and __le64 on both sides of the operations and
> > do not require extra endianness handling.
> >
> > Fixes: 3accf4762734 ("mac802154: Handle basic beaconing")
> > Reported-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> >   net/mac802154/scan.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
> > index cfbe20b1ec5e..8f98efec7753 100644
> > --- a/net/mac802154/scan.c
> > +++ b/net/mac802154/scan.c
> > @@ -419,8 +419,8 @@ int mac802154_send_beacons_locked(struct ieee802154_sub_if_data *sdata,
> >       local->beacon.mhr.fc.source_addr_mode = IEEE802154_EXTENDED_ADDRESSING;
> >       atomic_set(&request->wpan_dev->bsn, -1);
> >       local->beacon.mhr.source.mode = IEEE802154_ADDR_LONG;
> > -     local->beacon.mhr.source.pan_id = cpu_to_le16(request->wpan_dev->pan_id);
> > -     local->beacon.mhr.source.extended_addr = cpu_to_le64(request->wpan_dev->extended_addr);
> > +     local->beacon.mhr.source.pan_id = request->wpan_dev->pan_id;
> > +     local->beacon.mhr.source.extended_addr = request->wpan_dev->extended_addr;
> >       local->beacon.mac_pl.beacon_order = request->interval;
> >       local->beacon.mac_pl.superframe_order = request->interval;
> >       local->beacon.mac_pl.final_cap_slot = 0xf;
>
> This patch has been applied to the wpan-next tree and will be
> part of the next pull request to net-next. Thanks!

fyi: in my opinion, depending on system endianness this is actually a bug.

- Alex