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On 05/27/2012 05:13 AM, James Bottomley wrote:
> 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
AFIACT we don't use it.
- -Jeff
> c751085943362143f84346d274e0011419c84202 Author: Rafael J. Wysocki
> <rjw@xxxxxxx> 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.
>
> James
>
> ---
>
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index
> bea04e5..ac6ea28 100644 --- a/drivers/scsi/Kconfig +++
> b/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
>
> diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index
> 8deedea..f188509 100644 --- a/drivers/scsi/Makefile +++
> b/drivers/scsi/Makefile @@ -161,8 +161,6 @@
> 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 diff --git
> a/drivers/scsi/scsi_wait_scan.c b/drivers/scsi/scsi_wait_scan.c
> deleted file mode 100644 index 74708fc..0000000 ---
> a/drivers/scsi/scsi_wait_scan.c +++ /dev/null @@ -1,42 +0,0 @@ -/*
> - * scsi_wait_scan.c - * - * Copyright (C) 2006 James Bottomley
> <James.Bottomley@xxxxxxxxxxxx> - * - * 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/scsi_scan.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(); - /* - * and then we
> wait for the actual asynchronous scsi scan - * to finish. - */ -
> scsi_complete_async_scans(); - 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);
>
>
- --
Jeff Mahoney
SUSE Labs
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