linux-kernel - Re: [PATCH v1] drm/bridge: anx7625: Don't store unread return value

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Date:   Wed, 18 Aug 2021 18:15:15 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Xin Ji <xji@...logixsemi.com>,
        Pi-Hsun Shih <pihsun@...omium.org>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v1] drm/bridge: anx7625: Don't store unread return value

Hey Sam,

> > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > index 14d73fb1dd15b..3471785915c45 100644
> > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > @@ -771,7 +771,7 @@ static int segments_edid_read(struct anx7625_data *ctx,
> >               ret = sp_tx_aux_rd(ctx, 0xf1);
> >
> >               if (ret) {
> > -                     ret = sp_tx_rst_aux(ctx);
> > +                     sp_tx_rst_aux(ctx);
> >                       DRM_DEV_ERROR(dev, "segment read fail, reset!\n");
> >               } else {
> >                       ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
>
> From a quick look this seems to be the wrong fix.
> Replace return 0; with return ret; as the last line in this function
> looks like the correct fix to me.
> With a careful audit that the error handling is OK in said function.

Thanks for the suggestion, let me have a second look at it.

>
>         Sam