scsi: dpt_i2o: Remove obsolete driver

The dpt_i2o driver was fixed to stop using virt_to_bus() in 2008, but it
still has a stale reference in an error handling code path that could never
work. I submitted a patch to fix this reference earlier, but Hannes
Reinecke suggested that removing the driver may be just as good here.

The i2o driver layer was removed in 2015 with commit 4a72a7a
("staging: remove i2o subsystem"), but the even older dpt_i2o scsi driver
stayed around.

The last non-cleanup patches I could find were from Miquel van Smoorenburg
and Mark Salyzyn back in 2008, they might know if there is any chance of
the hardware still being used anywhere.

Link: https://lore.kernel.org/linux-scsi/CAK8P3a1XfwkTOV7qOs1fTxf4vthNBRXKNu8A5V7TWnHT081NGA@mail.gmail.com/T/
Link: https://lore.kernel.org/r/20220624155226.2889613-3-arnd@kernel.org
Cc: Miquel van Smoorenburg <mikevs@xs4all.net>
Cc: Mark Salyzyn <salyzyn@android.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/userspace-api/ioctl/ioctl-number.rst

@@ -120,7 +120,7 @@ Code  Seq#    Include File                                           Comments
 'C'   01-2F  linux/capi.h                                            conflict!
 'C'   F0-FF  drivers/net/wan/cosa.h                                  conflict!
 'D'   all    arch/s390/include/asm/dasd.h
-'D'   40-5F  drivers/scsi/dpt/dtpi_ioctl.h
+'D'   40-5F  drivers/scsi/dpt/dtpi_ioctl.h                           Dead since 2022
 'D'   05     drivers/scsi/pmcraid.h
 'E'   all    linux/input.h                                           conflict!
 'E'   00-0F  xen/evtchn.h                                            conflict!

MAINTAINERS

@@ -6116,14 +6116,6 @@ F:	Documentation/networking/device_drivers/ethernet/freescale/dpaa2/switch-drive
 F:	drivers/net/ethernet/freescale/dpaa2/dpaa2-switch*
 F:	drivers/net/ethernet/freescale/dpaa2/dpsw*
 
-DPT_I2O SCSI RAID DRIVER
-M:	Adaptec OEM Raid Solutions <aacraid@microsemi.com>
-L:	linux-scsi@vger.kernel.org
-S:	Maintained
-W:	http://www.adaptec.com/
-F:	drivers/scsi/dpt*
-F:	drivers/scsi/dpt/
-
 DRBD DRIVER
 M:	Philipp Reisner <philipp.reisner@linbit.com>
 M:	Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/scsi/Kconfig

@@ -458,17 +458,6 @@ config SCSI_MVUMI
 	  To compile this driver as a module, choose M here: the
 	  module will be called mvumi.
 
-config SCSI_DPT_I2O
-	tristate "Adaptec I2O RAID support "
-	depends on SCSI && PCI && VIRT_TO_BUS
-	help
-	  This driver supports all of Adaptec's I2O based RAID controllers as 
-	  well as the DPT SmartRaid V cards.  This is an Adaptec maintained
-	  driver by Deanna Bonds.  See <file:Documentation/scsi/dpti.rst>.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called dpt_i2o.
-
 config SCSI_ADVANSYS
 	tristate "AdvanSys SCSI support"
 	depends on SCSI

drivers/scsi/Makefile

@@ -63,7 +63,6 @@ obj-$(CONFIG_BVME6000_SCSI)	+= 53c700.o	bvme6000_scsi.o
 obj-$(CONFIG_SCSI_SIM710)	+= 53c700.o	sim710.o
 obj-$(CONFIG_SCSI_ADVANSYS)	+= advansys.o
 obj-$(CONFIG_SCSI_BUSLOGIC)	+= BusLogic.o
-obj-$(CONFIG_SCSI_DPT_I2O)	+= dpt_i2o.o
 obj-$(CONFIG_SCSI_ARCMSR)	+= arcmsr/
 obj-$(CONFIG_SCSI_AHA152X)	+= aha152x.o
 obj-$(CONFIG_SCSI_AHA1542)	+= aha1542.o