linux-kernel - Re: [PATCH 3/5] gma500: fix a missing break in psb_intel_crtc_mode

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Date:   Fri, 1 Apr 2022 11:53:40 +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 3/5] gma500: fix a missing break in psb_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 result in multiple 'is_*' flags being set with true mistakely.
>
> To fix this, when found the entry, add a break after the switch
> statement.
>
> Fixes: 89c78134cc54d (" gma500: Add Poulsbo support")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>

This patch doesn't apply for me and needs to be rebased on top of
drm-misc-next or drm-tip.

On Poulsbo there should only be one encoder per crtc so this is only a
theoretical issue. But it is good practice to exit the loop early if
we can so the patch still makes sense.

Also, please use the correct subject prefix: drm/gma500: instead of
just gma500:.

Thanks
Patrik

> ---
>  drivers/gpu/drm/gma500/psb_intel_display.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/gma500/psb_intel_display.c b/drivers/gpu/drm/gma500/psb_intel_display.c
> index 42d1a733e124..85fc61bf333a 100644
> --- a/drivers/gpu/drm/gma500/psb_intel_display.c
> +++ b/drivers/gpu/drm/gma500/psb_intel_display.c
> @@ -134,6 +134,8 @@ static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
>                         is_tv = true;
>                         break;
>                 }
> +
> +               break;
>         }
>
>         refclk = 96000;
> --
> 2.17.1
>