[PATCH] drm: Only take cursor locks when the cursor plane exists

[Sean Paul]

On Fri, Apr 07, 2017 at 06:48:17PM +0200, Daniel Vetter wrote:
> I thought I've fixed this, but maybe not. Anyway, clearly broken, and
> easy fix.
> 
> Cc: Tony Lindgren <tony at atomide.com>
> Reported-by: Tony Lindgren <tony at atomide.com>
> Fixes: b95ff0319a82 ("drm: Remove drm_modeset_(un)lock_crtc")
> Cc: Harry Wentland <harry.wentland at amd.com>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Sean Paul <seanpaul at chromium.org>
> Cc: David Airlie <airlied at linux.ie>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---

Applied to drm-misc

Thanks,

Sean

>  drivers/gpu/drm/drm_plane.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 838ca742a28b..fedd4d60d9cd 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -720,15 +720,15 @@ static int drm_mode_cursor_common(struct drm_device *dev,
>  	ret = drm_modeset_lock(&crtc->mutex, &ctx);
>  	if (ret)
>  		goto out;
> -	ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
> -	if (ret)
> -		goto out;
> -
>  	/*
>  	 * If this crtc has a universal cursor plane, call that plane's update
>  	 * handler rather than using legacy cursor handlers.
>  	 */
>  	if (crtc->cursor) {
> +		ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
> +		if (ret)
> +			goto out;
> +
>  		ret = drm_mode_cursor_universal(crtc, req, file_priv, &ctx);
>  		goto out;
>  	}
> -- 
> 2.11.0

-- 
Sean Paul, Software Engineer, Google / Chromium OS