linux-kernel - Re: [PATCH 2/4] drm/dp_mst: Reformat drm_dp_check_act

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Date:   Mon, 6 Apr 2020 15:23:46 -0400
From:   Sean Paul <sean@...rly.run>
To:     Lyude Paul <lyude@...hat.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        stable <stable@...r.kernel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Airlie <airlied@...hat.com>,
        Todd Previte <tprevite@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] drm/dp_mst: Reformat drm_dp_check_act_status() a bit

On Fri, Apr 3, 2020 at 4:08 PM Lyude Paul <lyude@...hat.com> wrote:
>
> Just add a bit more line wrapping, get rid of some extraneous
> whitespace, remove an unneeded goto label, and move around some variable
> declarations. No functional changes here.
>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> [this isn't a fix, but it's needed for the fix that comes after this]
> Fixes: ad7f8a1f9ced ("drm/helper: add Displayport multi-stream helper (v0.6)")
> Cc: Sean Paul <sean@...rly.run>
> Cc: <stable@...r.kernel.org> # v3.17+
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 22 ++++++++++------------
>  1 file changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 2b9ce965f044..7aaf184a2e5f 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -4473,33 +4473,31 @@ static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
>   */
>  int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
>  {
> +       int count = 0, ret;
>         u8 status;
> -       int ret;
> -       int count = 0;
>
>         do {
> -               ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
> -
> +               ret = drm_dp_dpcd_readb(mgr->aux,
> +                                       DP_PAYLOAD_TABLE_UPDATE_STATUS,
> +                                       &status);
>                 if (ret < 0) {
> -                       DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
> -                       goto fail;
> +                       DRM_DEBUG_KMS("failed to read payload table status %d\n",
> +                                     ret);
> +                       return ret;
>                 }
>
>                 if (status & DP_PAYLOAD_ACT_HANDLED)
>                         break;
>                 count++;
>                 udelay(100);
> -
>         } while (count < 30);
>
>         if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
> -               DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
> -               ret = -EINVAL;
> -               goto fail;
> +               DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n",

Should we print status in base16 here?

Otherwise:

Reviewed-by: Sean Paul <sean@...rly.run>

> +                             status, count);
> +               return -EINVAL;
>         }
>         return 0;
> -fail:
> -       return ret;
>  }
>  EXPORT_SYMBOL(drm_dp_check_act_status);
>
> --
> 2.25.1
>