netdev - Re: [PATCH wpan-next v2 10/11] net: mac802154: Add a warning in the hot path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK-6q+h=gNqoUHYi_2xamdGyMOYpO0GDO6--oKXSevJC9Wywag@mail.gmail.com>
Date:   Tue, 17 May 2022 20:59:39 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Network Development <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>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next v2 10/11] net: mac802154: Add a warning in the
 hot path

Hi,

On Tue, May 17, 2022 at 10:53 AM Miquel Raynal
<miquel.raynal@...tlin.com> wrote:
>
>
> miquel.raynal@...tlin.com wrote on Tue, 17 May 2022 15:36:55 +0200:
>
> > aahringo@...hat.com wrote on Sun, 15 May 2022 18:30:15 -0400:
> >
> > > Hi,
> > >
> > > On Thu, May 12, 2022 at 10:34 AM Miquel Raynal
> > > <miquel.raynal@...tlin.com> wrote:
> > > >
> > > > We should never start a transmission after the queue has been stopped.
> > > >
> > > > But because it might work we don't kill the function here but rather
> > > > warn loudly the user that something is wrong.
> > > >
> > > > Set an atomic when the queue will remain stopped. Reset this atomic when
> > > > the queue actually gets restarded. Just check this atomic to know if the
> > > > transmission is legitimate, warn if it is not.
> > > >
> > > > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > > ---
> > > >  include/net/cfg802154.h |  1 +
> > > >  net/mac802154/tx.c      | 16 +++++++++++++++-
> > > >  net/mac802154/util.c    |  1 +
> > > >  3 files changed, 17 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
> > > > index 8b6326aa2d42..a1370e87233e 100644
> > > > --- a/include/net/cfg802154.h
> > > > +++ b/include/net/cfg802154.h
> > > > @@ -218,6 +218,7 @@ struct wpan_phy {
> > > >         struct mutex queue_lock;
> > > >         atomic_t ongoing_txs;
> > > >         atomic_t hold_txs;
> > > > +       atomic_t queue_stopped;
> > >
> > > Maybe some test_bit()/set_bit() is better there?
> >
> > What do you mean? Shall I change the atomic_t type of queue_stopped?
> > Isn't the atomic_t preferred in this situation?
>
> Actually I re-read the doc and that's right, a regular unsigned long

Which doc is that?

- Alex