From e343c85763e7b981a5e9b53b04f90f0d83bffaaf Mon Sep 17 00:00:00 2001
From: Pratyush Anand <panand@redhat.com>
Date: Wed, 16 Mar 2016 09:16:24 +0530
Subject: [PATCH] watchdog: ensure that module is loaded as early as possible
It is expected that a watchdog module will disable an active watchdog when
its probe is called ie, when it is loaded. So an early load of the module
will help to disable it earlier.
This can be helpful in some corner cases where kdump and watchdog daemon
both are active.
Testing:
-- When watchdog kernel modules were added
# dracut --no-hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img -f etc/cmdline.d/00-watchdog.conf
rd.driver.pre=iTCO_wdt,lpc_ich,
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
---
modules.d/04watchdog/module-setup.sh | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/modules.d/04watchdog/module-setup.sh b/modules.d/04watchdog/module-setup.sh
index 0ffaa96..c9da148 100755
--- a/modules.d/04watchdog/module-setup.sh
+++ b/modules.d/04watchdog/module-setup.sh
@@ -34,6 +34,7 @@ install() {
installkernel() {
[[ -d /sys/class/watchdog/ ]] || return
+ wdtcmdline=""
for dir in /sys/class/watchdog/*; do
[[ -d "$dir" ]] || continue
[[ -f "$dir/state" ]] || continue
@@ -47,6 +48,7 @@ installkernel() {
# represented by modalias
wdtdrv=$(modprobe -R $wdtdrv)
instmods $wdtdrv
+ wdtcmdline="$wdtcmdline$(echo $wdtdrv | tr " " ","),"
# however in some cases, we also need to check that if there is
# a specific driver for the parent bus/device. In such cases
# we also need to enable driver for parent bus/device.
@@ -56,7 +58,10 @@ installkernel() {
wdtpdrv=$(< "$wdtppath/modalias")
wdtpdrv=$(modprobe -R $wdtpdrv)
instmods $wdtpdrv
+ wdtcmdline="$wdtcmdline$(echo $wdtpdrv | tr " " ","),"
wdtppath=$(readlink -f "$wdtppath/..")
done
done
+ # ensure that watchdog module is loaded as early as possible
+ [[ $wdtcmdline = "" ]] || echo "rd.driver.pre=$wdtcmdline" > ${initdir}/etc/cmdline.d/00-watchdog.conf
}