media_gobj_destroy() may be called twice on one instance - once by
media_device_unregister() and again by dvb_media_device_free(). The
function media_remove_intf_links() establishes and documents the
convention that mdev==NULL means that the object is not registered,
but nobody ever NULLs this variable. So this patch really implements
this behavior, and adds another mdev==NULL check to
media_gobj_destroy() to protect against double removal.
Signed-off-by: Max Kellermann <max@xxxxxxxxxxx>
---
drivers/media/media-entity.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index d8a2299..9526338 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -203,10 +203,16 @@ void media_gobj_destroy(struct media_gobj *gobj)
{
dev_dbg_obj(__func__, gobj);
+ /* Do nothing if the object is not linked. */
+ if (gobj->mdev == NULL)
+ return;
+
gobj->mdev->topology_version++;
/* Remove the object from mdev list */
list_del(&gobj->list);
+
+ gobj->mdev = NULL;
}
int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
--
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