linux-kernel - Re: [PATCH] drm/amdgpu/display: Fix an error handling path in 'dm_update_crtc

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Date:   Thu, 12 Mar 2020 16:38:42 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Walter Harms <wharms@....de>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "harry.wentland@....com" <harry.wentland@....com>,
        "sunpeng.li@....com" <sunpeng.li@....com>,
        "alexander.deucher@....com" <alexander.deucher@....com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "David1.Zhou@....com" <David1.Zhou@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "nicholas.kazlauskas@....com" <nicholas.kazlauskas@....com>,
        "Bhawanpreet.Lakha@....com" <Bhawanpreet.Lakha@....com>,
        "mario.kleiner.de@...il.com" <mario.kleiner.de@...il.com>,
        "David.Francis@....com" <David.Francis@....com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu/display: Fix an error handling path in
 'dm_update_crtc_state()'

On Mon, Mar 09, 2020 at 08:24:04AM +0000, Walter Harms wrote:
> 
> ________________________________________
> Von: kernel-janitors-owner@...r.kernel.org <kernel-janitors-owner@...r.kernel.org> im Auftrag von Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Gesendet: Sonntag, 8. März 2020 10:26
> An: harry.wentland@....com; sunpeng.li@....com; alexander.deucher@....com; christian.koenig@....com; David1.Zhou@....com; airlied@...ux.ie; daniel@...ll.ch; nicholas.kazlauskas@....com; Bhawanpreet.Lakha@....com; mario.kleiner.de@...il.com; David.Francis@....com
> Cc: amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org; kernel-janitors@...r.kernel.org; Christophe JAILLET
> Betreff: [PATCH] drm/amdgpu/display: Fix an error handling path in 'dm_update_crtc_state()'
> 
> 'dc_stream_release()' may be called twice. Once here, and once below in the
> error handling path if we branch to the 'fail' label.
> 
> Set 'new_stream' to NULL, once released to avoid the duplicated release
> function call.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Maybe the 'goto fail' at line 7745 should be turned into a 'return ret'
> instead. Could be clearer.
> 
> No Fixes tag provided because I've not been able to dig deep enough in the
> git history.
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 97c1b01c0fc1..9d7773a77c4f 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -7704,8 +7704,10 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
> 
>  skip_modeset:
>         /* Release extra reference */
> -       if (new_stream)
> -                dc_stream_release(new_stream);
> +       if (new_stream) {
> +               dc_stream_release(new_stream);
> +               new_stream = NULL;
> +       }
> 
> 
> dc_stream_release() is NULL-checked, so the if can be dropped.
> 
> re,
>  wh

Walter, it's really hard to separate your reply from the quoted email.
What's going on with that?  Could you configure your email client to
use "> " for the quoted bit?

regards,
dan carpenter