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This patch changes the spinlock to mutex for the available fakelb phy list. When holding the spinlock the ieee802154_unregister_hw is called which holding the rtnl_mutex, in that case we get a "BUG: sleeping function called from invalid context" error. We simple change the spinlock to mutex which allows to hold the rtnl lock there. Signed-off-by: Alexander Aring <aar@pengutronix.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>