[PATCH] SCSI: explain the hidden scsi_wait_scan Kconfig variable

From: Stefan Richter
Date: Wed Jun 17 2009 - 06:07:47 EST

People keep sending patches to expose CONFIG_SCSI_WAIT_SCAN as a tunable
item. These patches aren't accepted upstream, so let's stop the ongoing
irritation of people due to this obscure and strange installed module
and its Kconfig option.

Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
drivers/scsi/Kconfig | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)

Index: b/drivers/scsi/Kconfig
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -259,10 +259,25 @@ config SCSI_SCAN_ASYNC
or async on the kernel's command line.

- tristate
+ tristate # No prompt here, this is a hidden option.
default m
depends on SCSI
depends on MODULES
+ help
+ 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 buses before allowing the boot
+ to proceed.
+ Of course this does not work if targets boot independently of and
+ in parallel with the initiator, and/ or with transports with non-
+ deterministic target discovery schemes, and/ or if a transport
+ driver does not support scsi_wait_scan.
+ Still, this option 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

Stefan Richter
-=====-==--= -==- =---=

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