Re: [PATCH 07/23] drm: Make the fb refcount handover less magic

From: Daniel Vetter <daniel@ffwll.ch>
To: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 07/23] drm: Make the fb refcount handover less magic
Date: Tue, 27 Mar 2018 09:49:16 +0200	[thread overview]
Message-ID: <20180327074916.GJ14155@phenom.ffwll.local> (raw)
In-Reply-To: <20180322152313.6561-8-ville.syrjala@linux.intel.com>

On Thu, Mar 22, 2018 at 05:22:57PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Instead of assigning the plane->fb pointer and clearing the fb pointer
> to hand over the reference, let's just do it by grabbing another
> referece for plane->fb and let fb keep its original one.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  drivers/gpu/drm/drm_plane.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index bedceca7dd06..008f9456a5e8 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -1084,8 +1084,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
>  		plane->old_fb = NULL;
>  	} else {
>  		plane->fb = fb;
> -		/* Unref only the old framebuffer. */
> -		fb = NULL;
> +		drm_framebuffer_get(fb);
>  	}
>  
>  out:
> -- 
> 2.16.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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