[SCSI] Remove scsi_wait_scan module

scsi_wait_scan was introduced with asynchronous host scanning as a hack
for distributions that weren't using proper udev based wait for root to
appear in their initramfs scripts.  In 2.6.30 Commit

c7510859
Author: Rafael J. Wysocki <rjw@sisk.pl>
Date:   Sun Apr 12 20:06:56 2009 +0200

    PM/Hibernate: Wait for SCSI devices scan to complete during resume

Actually broke scsi_wait_scan because it renders
scsi_complete_async_scans() a nop for modular SCSI if you include
scsi_scans.h (which this module does).

The lack of bug reports is sufficient proof that this module is no
longer used.

Cc: Jeff Mahoney <jeffm@suse.de>
Cc: Dave Jones <davej@redhat.com>
Cc: maximilian attems <max@stro.at>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

drivers/scsi/Kconfig

@@ -263,23 +263,6 @@ config SCSI_SCAN_ASYNC
 	  You can override this choice by specifying "scsi_mod.scan=sync"
 	  or async on the kernel's command line.
 
-config SCSI_WAIT_SCAN
-	tristate  # No prompt here, this is an invisible symbol.
-	default m
-	depends on SCSI
-	depends on MODULES
-# scsi_wait_scan is a loadable module which waits until all the async scans are
-# complete.  The idea is to use it in initrd/ initramfs scripts.  You modprobe
-# it after all the modprobes of the root SCSI drivers and it will wait until
-# they have all finished scanning their buses before allowing the boot to
-# proceed.  (This method is not applicable if targets boot independently in
-# parallel with the initiator, or with transports with non-deterministic target
-# discovery schemes, or if a transport driver does not support scsi_wait_scan.)
-#
-# This symbol is not exposed as a prompt because little is to be gained by
-# disabling it, whereas people who accidentally switch it off may wonder why
-# their mkinitrd gets into trouble.
-
 menu "SCSI Transports"
 	depends on SCSI
 

drivers/scsi/Makefile

@@ -159,8 +159,6 @@ obj-$(CONFIG_SCSI_OSD_INITIATOR) += osd/
 # This goes last, so that "real" scsi devices probe earlier
 obj-$(CONFIG_SCSI_DEBUG)	+= scsi_debug.o
 
-obj-$(CONFIG_SCSI_WAIT_SCAN)	+= scsi_wait_scan.o
-
 scsi_mod-y			+= scsi.o hosts.o scsi_ioctl.o constants.o \
 				   scsicam.o scsi_error.o scsi_lib.o
 scsi_mod-$(CONFIG_SCSI_DMA)	+= scsi_lib_dma.o

drivers/scsi/scsi_wait_scan.c

-/*
- * scsi_wait_scan.c
- *
- * Copyright (C) 2006 James Bottomley <James.Bottomley@SteelEye.com>
- *
- * This is a simple module to wait until all the async scans are
- * complete.  The idea is to use it in initrd/initramfs scripts.  You
- * modprobe it after all the modprobes of the root SCSI drivers and it
- * will wait until they have all finished scanning their busses before
- * allowing the boot to proceed
- */
-
-#include <linux/module.h>
-#include <linux/device.h>
-#include "scsi_priv.h"
-
-static int __init wait_scan_init(void)
-{
-	/*
-	 * First we need to wait for device probing to finish;
-	 * the drivers we just loaded might just still be probing
-	 * and might not yet have reached the scsi async scanning
-	 */
-	wait_for_device_probe();
-	return 0;
-}
-
-static void __exit wait_scan_exit(void)
-{
-}
-
-MODULE_DESCRIPTION("SCSI wait for scans");
-MODULE_AUTHOR("James Bottomley");
-MODULE_LICENSE("GPL");
-
-late_initcall(wait_scan_init);
-module_exit(wait_scan_exit);