drm/omap: fix race condition with dev->obj_list
omap_gem_objects are added to dev->obj_list in omap_gem_new, and removed
in omap_gem_free_object. Unfortunately there's no locking for
dev->obj_list, which eventually leads to a crash:
WARNING: CPU: 1 PID: 1123 at lib/list_debug.c:59 __list_del_entry+0xa4/0xe0()
list_del corruption. prev->next should be e9281344, but was ea722b84
Add a spinlock to protect dev->obj_list.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index c4c2373..c698098 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -491,6 +491,7 @@
priv->wq = alloc_ordered_workqueue("omapdrm", 0);
+ spin_lock_init(&priv->list_lock);
INIT_LIST_HEAD(&priv->obj_list);
omap_gem_init(dev);