centos man page for __scsi_device_lookup

__SCSI_DEVICE_LOOKUP(9) 					  SCSI mid layer					   __SCSI_DEVICE_LOOKUP(9)

NAME
       __scsi_device_lookup - find a device given the host (UNLOCKED)

SYNOPSIS
       struct scsi_device * __scsi_device_lookup(struct Scsi_Host * shost, uint channel, uint id, uint lun);

ARGUMENTS
       shost
	   SCSI host pointer

       channel
	   SCSI channel (zero if only one channel)

       id
	   SCSI target number (physical unit number)

       lun
	   SCSI Logical Unit Number

DESCRIPTION
       Looks up the scsi_device with the specified channel, id, lun for a given host. The returned scsi_device does not have an additional
       reference. You must hold the host's host_lock over this call and any access to the returned scsi_device.

NOTE
       The only reason why drivers would want to use this is because they need to access the device list in irq context. Otherwise you really want
       to use scsi_device_lookup instead.

AUTHORS
       James Bottomley <James.Bottomley@hansenpartnership.com>
	   Author.

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   __SCSI_DEVICE_LOOKUP(9)