Re: [PATCH] pinctrl: pxa: pxa2xx: Remove 'pxa2xx_pinctrl_exit()' which is unused and broken

[Dan Carpenter <dan.carpenter@oracle.com>]

On Thu, Jun 04, 2020 at 12:08:49AM +0200, Linus Walleij wrote:
> On Mon, Jun 1, 2020 at 8:31 PM Dan Carpenter <dan.carpenter@oracle.com> wrote:
> > On Mon, Jun 01, 2020 at 01:31:23PM +0200, Christophe JAILLET wrote:
> > > Le 01/06/2020 à 10:58, Robert Jarzmik a écrit :
> > > > Christophe JAILLET <christophe.jaillet@wanadoo.fr> writes:
> > > >
> > > > > Commit 6d33ee7a0534 ("pinctrl: pxa: Use devm_pinctrl_register() for pinctrl registration")
> > > > > has turned a 'pinctrl_register()' into 'devm_pinctrl_register()' in
> > > > > 'pxa2xx_pinctrl_init()'.
> > > > > However, the corresponding 'pinctrl_unregister()' call in
> > > > > 'pxa2xx_pinctrl_exit()' has not been removed.
> > > > >
> > > > > This is not an issue, because 'pxa2xx_pinctrl_exit()' is unused.
> > > > > Remove it now to avoid some wondering in the future and save a few LoC.
> > > > >
> > > > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> > > > Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
> > > >
> > > > Would be even a better patch with a :
> > > > Fixes: 6d33ee7a0534 ("pinctrl: pxa: Use devm_pinctrl_register() for pinctrl registration")
> > >
> > > I was wondering it was was needed in this case.
> > > The patch does not really fix anything, as the function is unused. Or it
> > > fixes things on a theoretical point of view.
> >
> > There is no concensus...  We should call a vote on this at Kernel
> > Summit.  :P
> 
> Fixes means it fixes something that was wrong in that commit.
> That's all. Whether syntactic or semantic or regression or
> serious or not does not matter. It is also not compulsory to
> add it is just helpful.

Fixes tag should be compulsory for actual bug fixes.  We had a the
Bad Binder exploit last year because commit f5cb779ba163
("ANDROID: binder: remove waitqueue when thread exits.") had no Fixes
tag and wasn't backported to Android kernels.

regards,
dan carpenter