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Subject[PATCH v6 2/2] drm: Prevent release fb after cleanup mode config
Date
After unbinding drm, the user space may still owns the drm dev fd,
and may trigger fb release after cleanup mode config.

Add a sanity check to prevent that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v6: None
Changes in v5: None
Changes in v2: None

drivers/gpu/drm/drm_framebuffer.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index e8f9c13..03c1632 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -583,6 +583,11 @@ void drm_fb_release(struct drm_file *priv)
{
struct drm_framebuffer *fb, *tfb;
struct drm_mode_rmfb_work arg;
+ struct drm_minor *minor = priv->minor;
+ struct drm_device *dev = minor->dev;
+
+ if (WARN_ON(!dev->mode_config.num_fb && !list_empty(&priv->fbs)))
+ return;

INIT_LIST_HEAD(&arg.fbs);

--
2.1.4

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