linux-kernel - [PATCH 3/3] drm/ttm: Fix ttm_bo

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Date:   Sun, 14 Apr 2019 23:37:29 +0000
From:   Brian Yip <itsbriany@...il.com>
To:     christian.koenig@....com
Cc:     ray.huang@....com, Jerry.Zhang@....com, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Brian Yip <itsbriany@...il.com>
Subject: [PATCH 3/3] drm/ttm: Fix ttm_bo_glob.kobj state on cleanup

Cleanup ttm_bo_glob.kobj when its reference count hits 0
so that it can be re-initialized by future ttm_bo_global_init calls
without dumping a stack trace.

Signed-off-by: Brian Yip <itsbriany@...il.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 988416fb8a0b..1e1844f4a4fa 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1535,6 +1535,10 @@ static void ttm_bo_global_release(void)
 	kobject_del(&glob->kobj);
 	kobject_put(&glob->kobj);
 	ttm_mem_global_release(&ttm_mem_glob);
+
+	if (!kref_read(&glob->kobj.kref))
+		glob->kobj.state_initialized = 0;
+
 out:
 	mutex_unlock(&ttm_global_mutex);
 }
-- 
2.20.1