USB: Add UAS driver

USB Attached SCSI is a new protocol specified jointly by the SCSI T10
committee and the USB Implementors Forum.

Signed-off-by: Matthew Wilcox <[email protected]>
Cc: Matthew Dharm <[email protected]>
[[email protected]: updated to use new USB_ prefix]
Signed-off-by: Michal Nazarewicz <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Matthew Wilcox

MAINTAINERS

@@ -5934,6 +5934,14 @@ S:	Maintained
 F:	Documentation/usb/acm.txt
 F:	drivers/usb/class/cdc-acm.*
 
+USB ATTACHED SCSI
+M:	Matthew Wilcox <[email protected]>
+M:	Sarah Sharp <[email protected]>
+L:	[email protected]
+L:	[email protected]
+S:	Supported
+F:	drivers/usb/storage/uas.c
+
 USB BLOCK DRIVER (UB ub)
 M:	Pete Zaitcev <[email protected]>
 L:	[email protected]

drivers/usb/storage/Kconfig

@@ -172,6 +172,19 @@ config USB_STORAGE_CYPRESS_ATACB
 
 	  If this driver is compiled as a module, it will be named ums-cypress.
 
+config USB_UAS
+	tristate "USB Attached SCSI"
+	depends on USB && SCSI
+	help
+	  The USB Attached SCSI protocol is supported by some USB
+	  storage devices.  It permits higher performance by supporting
+	  multiple outstanding commands.
+
+	  If you don't know whether you have a UAS device, it is safe to
+	  say 'Y' or 'M' here and the kernel will use the right driver.
+
+	  If you compile this driver as a module, it will be named uas.
+
 config USB_LIBUSUAL
 	bool "The shared table of common (or usual) storage devices"
 	depends on USB

drivers/usb/storage/Makefile

@@ -7,6 +7,7 @@
 
 EXTRA_CFLAGS	:= -Idrivers/scsi
 
+obj-$(CONFIG_USB_UAS)		+= uas.o
 obj-$(CONFIG_USB_STORAGE)	+= usb-storage.o
 
 usb-storage-obj-$(CONFIG_USB_STORAGE_DEBUG)	+= debug.o