Man page 9 : __scsi_device_lookup

__scsi_device_lookup - find a device given the host (UNLOCKED)

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

shost
    SCSI host pointer

channel
    SCSI channel (zero if only one channel)

id
    SCSI target number (physical unit number)

lun
    SCSI Logical Unit Number

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 hostAqs host_lock over this call and any access to the returned scsi_device.

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.

James Bottomley <>
    Author.

Rob Landley <>
    Author.