scsi_device_get — get an additional reference to a scsi_device
|struct scsi_device * sdev|
Gets a reference to the scsi_device and increments the use count of the underlying LLDD module. You must hold host_lock of the parent Scsi_Host or already have a reference when calling this.
This will fail if a device is deleted or cancelled, or when the LLD module is in the process of being unloaded.