linux-kernel - Re: [PATCH v5] wfx: use container

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Date:   Fri, 6 May 2022 12:50:30 -0400
From:   Jaehee <jhpark1013@...il.com>
To:     Jérôme Pouiller <jerome.pouiller@...abs.com>
Cc:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        Outreachy Linux Kernel <outreachy@...ts.linux.dev>,
        Stefano Brivio <sbrivio@...hat.com>
Subject: Re: [PATCH v5] wfx: use container_of() to get vif

On Wed, May 4, 2022 at 1:08 PM Jaehee Park <jhpark1013@...il.com> wrote:
>
> On Wed, May 04, 2022 at 09:21:21AM +0200, Jérôme Pouiller wrote:
> > On Tuesday 3 May 2022 20:21:46 CEST Jaehee Park wrote:
> > > Currently, upon virtual interface creation, wfx_add_interface() stores
> > > a reference to the corresponding struct ieee80211_vif in private data,
> > > for later usage. This is not needed when using the container_of
> > > construct. This construct already has all the info it needs to retrieve
> > > the reference to the corresponding struct from the offset that is
> > > already available, inherent in container_of(), between its type and
> > > member inputs (struct ieee80211_vif and drv_priv, respectively).
> > > Remove vif (which was previously storing the reference to the struct
> > > ieee80211_vif) from the struct wfx_vif, define a function
> > > wvif_to_vif(wvif) for container_of(), and replace all wvif->vif with
> > > the newly defined container_of construct.
> > >
> > > Signed-off-by: Jaehee Park <jhpark1013@...il.com>
> > > ---
> > > v2
> > > - Sequenced the wfx.h file (with the new defines) to show up first on
> > > the diff, which makes the ordering of the diff more logical.
> > >
> > > v3
> > > - Made edits to the commit message.
> > > - Shortened the macro name from wvif_to_vif to to_vif.
> > > - For functions that had more than one instance of vif, defined one
> > > reference vif at the beginning of the function and used that instead.
> > > - Broke the if-statements that ran long into two lines.
> > >
> > > v4
> > > - Changed macro into function and named it back to wvif_to_vif
> > > - Fit all lines in patch to 80 columns
> > > - Decared a reference to vif at the beginning of all the functions
> > > where it's being used
> > >
> > > v5
> > > - Placed longest declarations first
> > >
> > >
> > >  drivers/net/wireless/silabs/wfx/wfx.h     |  6 +-
> > >  drivers/net/wireless/silabs/wfx/data_rx.c |  5 +-
> > >  drivers/net/wireless/silabs/wfx/data_tx.c |  3 +-
> > >  drivers/net/wireless/silabs/wfx/key.c     |  4 +-
> > >  drivers/net/wireless/silabs/wfx/queue.c   |  3 +-
> > >  drivers/net/wireless/silabs/wfx/scan.c    | 11 ++--
> > >  drivers/net/wireless/silabs/wfx/sta.c     | 71 ++++++++++++++---------
> > >  7 files changed, 65 insertions(+), 38 deletions(-)
> > >
> > [...]
> > > diff --git a/drivers/net/wireless/silabs/wfx/sta.c b/drivers/net/wireless/silabs/wfx/sta.c
> > > index 3297d73c327a..040d1f9fb03a 100644
> > > --- a/drivers/net/wireless/silabs/wfx/sta.c
> > > +++ b/drivers/net/wireless/silabs/wfx/sta.c
> > > @@ -101,6 +101,7 @@ void wfx_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
> > >         struct wfx_vif *wvif = NULL;
> > >         struct wfx_dev *wdev = hw->priv;
> > >         bool filter_bssid, filter_prbreq, filter_beacon;
> > > +       struct ieee80211_vif *vif = wvif_to_vif(wvif);
> >
> > wvif is modified later in the function, so this one is not correct.
> >
>
> Hi Jerome, I'm so sorry about this. I'll check more carefully and
> correct for any other occurrences.
>

Hi Jerome,

Thank you for catching the mistake! I think this is the only place
where vif was set prematurely, but I could have missed something.

I will send a revised patch (now v6) with this edit today.

Thanks,
Jaehee

> >
> > --
> > Jérôme Pouiller
> >
> >