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authorJoel Becker <joel.becker@oracle.com>2008-06-17 15:34:32 -0700
committerMark Fasheh <mfasheh@suse.com>2008-07-31 16:21:13 -0700
commit70526b67443a980d5029d9cf06903bef731a4e96 (patch)
treeaf4558619eeeda7f0075017881d8274d03854ca9 /include/linux/configfs.h
parent99cefda42ac550863b5ae1df9e60322e377decf9 (diff)
[PATCH] configfs: Pin configfs subsystems separately from new config_items.
configfs_mkdir() creates a new item by calling its parent's ->make_item/group() functions. Once that object is created, configfs_mkdir() calls try_module_get() on the new item's module. If it succeeds, the module owning the new item cannot be unloaded, and configfs is safe to reference the item. If the item and the subsystem it belongs to are part of the same module, the subsystem is also pinned. This is the common case. However, if the subsystem is made up of multiple modules, this may not pin the subsystem. Thus, it would be possible to unload the toplevel subsystem module while there is still a child item. Thus, we now try_module_get() the subsystem's module. This only really affects children of the toplevel subsystem group. Deeper children already have their parents pinned. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'include/linux/configfs.h')
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