Merge branch 'bsg' of git://git.kernel.dk/data/git/linux-2.6-block

* 'bsg' of git://git.kernel.dk/data/git/linux-2.6-block:
  bsg: fix missing space in version print
  Don't define empty struct bsg_class_device if !CONFIG_BLK_DEV_BSG
  bsg: Kconfig updates
  bsg: minor cleanup
  bsg: device hash table cleanup
  bsg: fix initialization error handling bugs
  bsg: mark FUJITA Tomonori as bsg maintainer
  bsg: convert to dynamic major
  bsg: address various review comments

MAINTAINERS

@@ -913,6 +913,12 @@ M:	mchan@broadcom.com
 L:	netdev@vger.kernel.org
 S:	Supported
 
+BSG (block layer generic sg v4 driver)
+P:	FUJITA Tomonori
+M:	fujita.tomonori@lab.ntt.co.jp
+L:	linux-scsi@vger.kernel.org
+S:	Supported
+
 BTTV VIDEO4LINUX DRIVER
 P:	Mauro Carvalho Chehab
 M:	mchehab@infradead.org

block/Kconfig

@@ -52,11 +52,16 @@ config LSF
 endif # BLOCK
 
 config BLK_DEV_BSG
-	bool "Block layer SG support"
+	bool "Block layer SG support v4 (EXPERIMENTAL)"
 	depends on (SCSI=y) && EXPERIMENTAL
-	default y
 	---help---
-	Saying Y here will enable generic SG (SCSI generic) v4
-	support for any block device.
+	Saying Y here will enable generic SG (SCSI generic) v4 support
+	for any block device.
+
+	Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
+	can handle complicated SCSI commands: tagged variable length cdbs
+	with bidirectional data transfers and generic request/response
+	protocols (e.g. Task Management Functions and SMP in Serial
+	Attached SCSI).
 
 source block/Kconfig.iosched

include/linux/bsg.h

@@ -60,7 +60,6 @@ struct bsg_class_device {
 extern int bsg_register_queue(struct request_queue *, const char *);
 extern void bsg_unregister_queue(struct request_queue *);
 #else
-struct bsg_class_device { };
 #define bsg_register_queue(disk, name)		(0)
 #define bsg_unregister_queue(disk)	do { } while (0)
 #endif