[PATCH 1/2] Revert "drm/core: Preserve the fb id on close."

[Vincent Abriou]

This reverts commit 73f7570bc6c853ca1fad24f9d31815b20e405354.

This patch need to be revert because it breaks middlewares way of working.
As example, modetest and weston, only relies on drmModeRmFB to close
CRTC or planes.
Keeping this patch will induce weird behavior like a plane displayed
with modetest will be visible on weston and vice-versa.

We can overcome this by updating the middleware (successfully tested
with modetest) to force them to disable CRTC and plane using
drmModeSetCrtc or drmModeSetPlane.
But it is a long to way and for short term, it is not acceptable to break
ABI.


Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: David Herrmann <dh.herrmann at gmail.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Vincent Abriou <vincent.abriou at st.com>
---
 drivers/gpu/drm/drm_crtc.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e600a5f..626b0a5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3320,6 +3320,9 @@ int drm_mode_rmfb(struct drm_device *dev,
 	if (!found)
 		goto fail_lookup;
 
+	/* Mark fb as reaped, we still have a ref from fpriv->fbs. */
+	__drm_framebuffer_unregister(dev, fb);
+
 	list_del_init(&fb->filp_head);
 	mutex_unlock(&dev->mode_config.fb_lock);
 	mutex_unlock(&file_priv->fbs_lock);
@@ -3491,6 +3494,7 @@ out_err1:
  */
 void drm_fb_release(struct drm_file *priv)
 {
+	struct drm_device *dev = priv->minor->dev;
 	struct drm_framebuffer *fb, *tfb;
 
 	/*
@@ -3504,9 +3508,15 @@ void drm_fb_release(struct drm_file *priv)
 	 * at it any more.
 	 */
 	list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
+
+		mutex_lock(&dev->mode_config.fb_lock);
+		/* Mark fb as reaped, we still have a ref from fpriv->fbs. */
+		__drm_framebuffer_unregister(dev, fb);
+		mutex_unlock(&dev->mode_config.fb_lock);
+
 		list_del_init(&fb->filp_head);
 
-		/* This drops the fpriv->fbs reference. */
+		/* This will also drop the fpriv->fbs reference. */
 		drm_framebuffer_unreference(fb);
 	}
 }
-- 
1.9.1