ath6k del interface locking

[Jakub Kicinski <kuba@xxxxxxxxxx>]

Hi Kalle,

I've been looking at various issues around netdev registration and I
run across the code in ath6kl_cfg80211_del_iface().

AFAIU nl80211 already holds the rtnl lock, because the op has NEED_RTNL:

	{
		.cmd = NL80211_CMD_DEL_INTERFACE,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = nl80211_del_interface,
		.flags = GENL_UNS_ADMIN_PERM,
		.internal_flags = NL80211_FLAG_NEED_WDEV |
				  NL80211_FLAG_NEED_RTNL,
	},

So how come ath6kl_cfg80211_del_iface() takes the lock again?