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drm: delay minor destruction to drm_dev_free()

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Instead of freeing minors in drm_dev_unregister(), we only unplug them and
delay the free to drm_dev_free(). Note that if drm_dev_register() has
never been called, minors are NULL and this has no effect.

This change is needed to allow early device unregistration. If we want to
call drm_dev_unregister() on live devices, we need to guarantee that
minors are still valid (but unplugged). This way, any open file can still
access file_priv->minor->dev to get the DRM device. However, the minor is
unplugged so no new users can occur.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
David Herrmann 2013-10-20 18:55:45 +02:00 committed by Dave Airlie
parent f67e946bf2
commit 8f6599da8e
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/drm_stub.c
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@ -487,6 +487,10 @@ EXPORT_SYMBOL(drm_dev_alloc);
*/
void drm_dev_free(struct drm_device *dev)
{
drm_put_minor(dev->control);
drm_put_minor(dev->render);
drm_put_minor(dev->primary);
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_destroy(dev);
@ -601,9 +605,9 @@ void drm_dev_unregister(struct drm_device *dev)
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
drm_rmmap(dev, r_list->map);
drm_put_minor(dev->control);
drm_put_minor(dev->render);
drm_put_minor(dev->primary);
drm_unplug_minor(dev->control);
drm_unplug_minor(dev->render);
drm_unplug_minor(dev->primary);
list_del(&dev->driver_item);
}