CONFIG_BLK_SCSI_REQUEST (not configurable)

modulename: scsi_ioctl.ko

and/or

scsi_common.ko

configname: CONFIG_BLK_SCSI_REQUEST

Linux Kernel Configuration
└─>Enable the block layer
└─>BLK_SCSI_REQUEST
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
block/scsi_ioctl.c
depends
CONFIG_BLOCK

is depended by
CONFIG_CDROM_PKTCDVD