slowusb: ease the code in order to reduce entropy, one place for one thing.

There were several places where a mixture of sdelay and "sleep 10"
were called without worrying too much, resulting in slower boot
time, mainly. This commit should fix the mess and make some order
in the slowusb saga.

defaults/initrd.scripts

@@ -410,17 +410,23 @@ setup_hotplug() {
 	fi
 }
 
-check_slowusb() {
+setup_slowusb() {
+	# slowusb already set?
+	if [ "${DO_slowusb}" = "1" ]
+	then
+		return
+	fi
+
 	local usb_storage_dir="/sys/bus/usb/drivers/usb-storage"
 	if [ ! -d "${usb_storage_dir}" ]
 	then
+		# no automated slowusb required. no usb-storage devices attached.
 		return
 	fi
-	[ "${DO_slowusb}" ] || \
 	for x in "${usb_storage_dir}"/*
 	do
 		[ -d "${x}" ]  && [ "${x}" != "${usb_storage_dir}/module" ] \
-			&& { FORCE_slowusb="1" ; break ; }
+			&& { DO_slowusb="1" ; break ; }
 	done
 }
 
@@ -428,13 +434,8 @@ start_dev_mgr() {
 	if [ "${KV_2_6_OR_GREATER}" ]
 	then
 		cd /sys
-		[ "${DO_slowusb}" ] && sdelay
-		check_slowusb
-		[ "${FORCE_slowusb}" ] && sdelay
 		good_msg 'Activating mdev'
 		runmdev
-		[ "${DO_slowusb}" ] || \
-		[ "${FORCE_slowusb}" ] && sdelay
 		cd /
 	fi
 }
@@ -881,12 +882,12 @@ startLUKS() {
 
 sdelay() {
 	# Sleep a specific number of seconds if SDELAY is set otherwise only sleep
-	# 1 second
+	# 3 seconds, which is a much better default than 1 second (previous default)
-	if [ -n "${SDELAY}" ]
+	if [ "${SDELAY}" ]
 	then
 		sleep ${SDELAY}
 	else
-		sleep 1
+		sleep 3
 	fi
 }
 

defaults/linuxrc

@@ -289,6 +289,11 @@ fi
 # Delay if needed for USB hardware
 sdelay
 
+# Setup slow USB bits
+setup_slowusb
+# if doslowusb is passed, pause other 10 seconds
+[ "${DO_slowusb}" ] && sleep 10
+
 # Start device manager
 start_dev_mgr
 
@@ -675,10 +680,6 @@ then
 		fi
 	done
 
-	if [ "${DO_slowusb}" ] || [ "${FORCE_slowusb}" ]
-	then
-		sleep 10
-	fi
 	mkdir initramfs proc tmp sys 2>/dev/null
 	chmod 1777 tmp
 
@@ -694,11 +695,6 @@ then
 	# Let Init scripts know that we booted from CD
 	export CDBOOT
 	CDBOOT=1
-	check_slowusb
-	if [ "${DO_slowusb}" ] || [ "${FORCE_slowusb}" ]
-	then
-		sleep 10
-	fi
 else
 	if [ "${USE_UNIONFS_NORMAL}" = '1' ]
 	then