SCSI device question

[Aniruddha Bohra]

Hello,
	All SCSI devices cam/scsi/scsi_xx.c
do the following :
      /*
       * Install a global async callback.  This callback will
       * receive async callbacks like "new device found".
       */
                 csa.event_enable = AC_FOUND_DEVICE;
                 csa.callback = passasync;

	However, I did not find the code where the event is
triggered. Is it automatically done by the rescan code?
Is there a standard way to indicate to the peripheral drivers
that there is a new device on the bus?


Thanks
Aniruddha