[issue2158] iwn panics with assertion on boot.

[Edward O'Callaghan (via DragonFly issue tracker)]

Edward O'Callaghan <eocallaghan at auroraux.org> added the comment:

OK, I think I have figured out what is wrong, please correct me if I am wrong
however I think something like this happens on init:

static void iwn_init(void *arg)
. ..
 wlan_serialize_enter();
 iwn_init_locked(sc); -----> static void iwn_init_locked(struct iwn_softc *sc)
			  ...
			  /* Read firmware images from the filesystem. */
			  error = iwn_read_firmware(sc); -----> static int iwn_read_firmware(struct
iwn_softc *sc)
							  ...
							  /*
							  * Read firmware image from filesystem.  The firmware can block
							  * in a taskq and deadlock against our serializer so unlock
							  * while we do tihs.
							  */
							  wlan_assert_serialized(); <------- *KABOOM?*
							  wlan_serialize_exit();

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status: unread -> chatting

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