[PATCH] target: fix tcm_loop build errors when SCSI=m

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix build errors when CONFIG_SCSI=m and CONFIG_LOOPBACK_TARGET=y
by making LOOPBACK_TARGET depend on SCSI.

drivers/target/loopback/tcm_loop.o: In function `tcm_loop_port_link':
tcm_loop.c:(.text+0x445): undefined reference to `scsi_add_device'
drivers/target/loopback/tcm_loop.o: In function `tcm_loop_driver_remove':
tcm_loop.c:(.text+0x55c): undefined reference to `scsi_remove_host'
tcm_loop.c:(.text+0x564): undefined reference to `scsi_host_put'
drivers/target/loopback/tcm_loop.o: In function `tcm_loop_submission_work':
tcm_loop.c:(.text+0x7c4): undefined reference to `scmd_printk'
drivers/target/loopback/tcm_loop.o: In function `tcm_loop_driver_probe':
tcm_loop.c:(.text+0x7fb): undefined reference to `scsi_host_alloc'
tcm_loop.c:(.text+0x85b): undefined reference to `scsi_add_host_with_dma'
tcm_loop.c:(.text+0x896): undefined reference to `scsi_host_put'
drivers/target/loopback/tcm_loop.o: In function `tcm_loop_port_unlink':
tcm_loop.c:(.text+0x962): undefined reference to `scsi_device_lookup'
tcm_loop.c:(.text+0x972): undefined reference to `scsi_remove_device'
tcm_loop.c:(.text+0x97a): undefined reference to `scsi_device_put'
drivers/target/loopback/tcm_loop.o:(.data+0x210): undefined reference to `scsi_change_queue_depth'

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx>
Cc: linux-scsi@xxxxxxxxxxxxxxx
Cc: target-devel@xxxxxxxxxxxxxxx
Cc: Bart Van Assche <bart.vanassche@xxxxxxx>
---
 drivers/target/loopback/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20180806.orig/drivers/target/loopback/Kconfig
+++ linux-next-20180806/drivers/target/loopback/Kconfig
@@ -1,5 +1,6 @@
 config LOOPBACK_TARGET
 	tristate "TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module"
+	depends on SCSI
 	help
 	  Say Y here to enable the TCM Virtual SAS target and Linux/SCSI LLD
 	  fabric loopback module.