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

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Date:   Sat, 19 Oct 2019 21:04:31 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Wambui Karuga <wambui@...uga.xyz>
cc:     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, 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?

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

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
>
> --
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>