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From:   Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Mon, 28 Dec 2020 09:09:59 -0500
Message-ID: <CAKb7UvhvjW+q+FXKoNaWUYm1QqzZ_o6FNjJQbwBJ+Lo9ybBcKQ@mail.gmail.com>
Subject: Re: [PATCH 5.10 064/717] drm/edid: Fix uninitialized variable in drm_cvt_modes()
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        "# 3.9+" <stable@vger.kernel.org>, Lyude Paul <lyude@redhat.com>,
        Sasha Levin <sashal@kernel.org>
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Hi Greg,

Linus had to apply a fixup for this patch. Please ensure that it's in
your patch list:

commit d652d5f1eeeb06046009f4fcb9b4542249526916
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu Dec 17 09:27:57 2020 -0800

    drm/edid: fix objtool warning in drm_cvt_modes()

It does not appear to have a Fixes tag, so may not have been picked up
by your automated tooling.

Cheers,

  -ilia

On Mon, Dec 28, 2020 at 9:01 AM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> From: Lyude Paul <lyude@redhat.com>
>
> [ Upstream commit 991fcb77f490390bcad89fa67d95763c58cdc04c ]
>
> Noticed this when trying to compile with -Wall on a kernel fork. We
> potentially don't set width here, which causes the compiler to complain
> about width potentially being uninitialized in drm_cvt_modes(). So, let's
> fix that.
>
> Changes since v1:
> * Don't emit an error as this code isn't reachable, just mark it as such
> Changes since v2:
> * Remove now unused variable
>
> Fixes: 3f649ab728cd ("treewide: Remove uninitialized_var() usage")
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
> Link: https://patchwork.freedesktop.org/patch/msgid/20201105235703.1328115-1-lyude@redhat.com
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  drivers/gpu/drm/drm_edid.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 631125b46e04c..b84efd538a702 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3114,6 +3114,8 @@ static int drm_cvt_modes(struct drm_connector *connector,
>                 case 0x0c:
>                         width = height * 15 / 9;
>                         break;
> +               default:
> +                       unreachable();
>                 }
>
>                 for (j = 1; j < 5; j++) {
> --
> 2.27.0
>
>
>