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o do not put the chip into full sleep in ath_stop as it gains nothing and causes many parts to hang in ath_detach because we may touch the chip during vap teardown; this may also fix issues with unloading the module o add a note in ath_detach to explain ath_hal_detach puts the chip in low power mode; this is useful to know as it means unloading the module will place a pci device in the lowest possible power state o leave an #ifdef notyet marker for powering down the chip when a device is marked down; we can't do that until we handle all the ways the driver may be entered and touch the chip o fix resume by reloading the h/w key cache as it's been clobbered (for pci) by the socket being powered off; for station mode we directly stop+init the chip and then simulate a beacon miss to get the upper layers sync'd up; for other configs we must brute force stop+start the vaps so they go through the state machine
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