linux-kernel - Re: [Outreachy kernel] [PATCH] drm: remove unnecessary return variable

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Date:   Tue, 22 Oct 2019 11:19:25 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Wambui Karuga <wambui@...uga.xyz>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, airlied@...ux.ie, daniel@...ll.ch,
        sean@...rly.run, mripard@...nel.org,
        maarten.lankhorst@...ux.intel.com,
        outreachy-kernel@...glegroups.com,
        Wambui Karuga <wambui.karugax@...il.com>
Subject: Re: [Outreachy kernel] [PATCH] drm: remove unnecessary return
 variable

On Sat, Oct 19, 2019 at 09:04:31PM +0200, Julia Lawall wrote:
> 
> 
> On Sat, 19 Oct 2019, Wambui Karuga wrote:
> 
> > From: Wambui Karuga <wambui.karugax@...il.com>
> >
> > Remove unnecessary variable `ret` in drm_dp_atomic_find_vcpi_slots()
> > only used to hold the function return value and have the function
> > return the value directly.
> 
> This patch applies for me, but with a huge offset.  What tree are you
> using?

For drm patches best practices is to base patches either on linux-next or
the drm-tip tree we have here:

https://cgit.freedesktop.org/drm-tip

drm moves quickly, so need to be on top of the latest version.

> Also, Greg won't apply this, because it's not targeting staging.  Is this
> for a specific outreachy project?

Yup it's for dri-devel, just applied it.

Thanks for the patch, nice cleanup!

Cheers, Daniel

> 
> julia
> 
> 
> > Issue found by coccinelle:
> > @@
> > local idexpression ret;
> > expression e;
> > @@
> >
> > -ret =
> > +return
> >      e;
> > -return ret;
> >
> > Signed-off-by: Wambui Karuga <wambui.karugax@...il.com>
> > ---
> >  drivers/gpu/drm/drm_dp_mst_topology.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> > index 9cccc5e63309..b854a422a523 100644
> > --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> > @@ -3540,7 +3540,7 @@ int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
> >  {
> >  	struct drm_dp_mst_topology_state *topology_state;
> >  	struct drm_dp_vcpi_allocation *pos, *vcpi = NULL;
> > -	int prev_slots, req_slots, ret;
> > +	int prev_slots, req_slots;
> >
> >  	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
> >  	if (IS_ERR(topology_state))
> > @@ -3587,8 +3587,7 @@ int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
> >  	}
> >  	vcpi->vcpi = req_slots;
> >
> > -	ret = req_slots;
> > -	return ret;
> > +	return req_slots;
> >  }
> >  EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
> >
> > --
> > 2.23.0
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@...glegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20191019071840.16877-1-wambui%40karuga.xyz.
> >

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch