linux-kernel - Re: [PATCH 2/5] gma500: fix a missing break in cdv_intel_crtc_mode

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Date:   Fri, 1 Apr 2022 11:28:19 +0200
From:   Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:     Xiaomeng Tong <xiam0nd.tong@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Zhao Yakui <yakui.zhao@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] gma500: fix a missing break in cdv_intel_crtc_mode_set

On Wed, Mar 30, 2022 at 2:03 PM Xiaomeng Tong <xiam0nd.tong@...il.com> wrote:
>
> Instead of exiting the loop as expected when an entry is found, the
> list_for_each_entry() continues until the traversal is complete. It
> could lead to a invalid reference to 'ddi_select' after the loop, and
> could lead to multiple 'is_*' flags being set with true mistakely, too.
>
> The invalid reference to 'ddi_select' is here:
>         cdv_dpll_set_clock_cdv(dev, crtc, &clock, is_lvds, ddi_select);
>
> To fix this, when found the entry, add a break after the switch statement.
>
> Fixes: d66760962d75 ("gma500: Program the DPLL lane based on the selected digitial port")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>

Hi, this one is also already fixed in:

commit b1a7d0ddb169774c3db5afe9e64124daea7fdd9f
Author: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Date:   Tue Mar 22 14:17:38 2022 +0100

    drm/gma500: Make use of the drm connector iterator

> ---
>  drivers/gpu/drm/gma500/cdv_intel_display.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/gma500/cdv_intel_display.c b/drivers/gpu/drm/gma500/cdv_intel_display.c
> index 94ebc48a4349..3e93019b17cb 100644
> --- a/drivers/gpu/drm/gma500/cdv_intel_display.c
> +++ b/drivers/gpu/drm/gma500/cdv_intel_display.c
> @@ -616,6 +616,8 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
>                         DRM_ERROR("invalid output type.\n");
>                         return 0;
>                 }
> +
> +               break;
>         }
>
>         if (dev_priv->dplla_96mhz)
> --
> 2.17.1
>