rfkill: detect bogus double-registering (v2)
Detect and abort with -EEXIST if rfkill_register is called twice on the same rfkill struct. And WARN_ON(it) for good measure. While at it, flag when we are adding the first switch of a type, we will need that information later. Signed-off-by: NHenrique de Moraes Holschuh <hmh@hmh.eng.br> Acked-by: NIvo van Doorn <IvDoorn@gmail.com> Cc: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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