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Because simple locks are spin locks, simple_lock( ) does not return
until the lock has been obtained.
The el_softc_lock member of the el_softc data structure points to
a simple lock data structure. The if_el device driver declares this data
structure by calling the decl_simple_lock_data( ) routine.
4
Calls the WRITE_CMD macro to write data to the command port register.
In this call, el_autosense_thread( ) passes the if_el driver’s
el_softc data structure pointer. The data to be written is the statistics
disable command (CMD_STATDIS).
5 Releases the simple lock and resets the IPL.
6 Calls the splx( ) routine to reset the CPU priority to the level that is
stored in the s variable.
5–26 Implementing the Autoconfiguration Support Section (probe)