explain the hidden scsi_wait_scan Kconfig variable
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 the unconditionally installed module and its
Kconfig symbol.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 6a19ed9..9c23122 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -258,10 +258,21 @@
or async on the kernel's command line.
config SCSI_WAIT_SCAN
- tristate
+ 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