Input: sparse-keymap - implement safer freeing of the keymap
Allow calling sparse_keymap_free() before unregistering input device whithout risk of racing with EVIOCGETKEYCODE and EVIOCSETKEYCODE. This makes life of drivers writers easier. Acked-by: Yong Wang <yong.y.wang@intel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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