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From f69cd051ab85fb01ddf00aadd3c559e85d8980f0 Mon Sep 17 00:00:00 2001
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From: Pratyush Anand <panand@redhat.com>
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Date: Wed, 16 Mar 2016 09:16:24 +0530
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Subject: [PATCH] watchdog: ensure that module is loaded as early as possible
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It is expected that a watchdog module will disable an active watchdog when
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its probe is called ie, when it is loaded. So an early load of the module
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will help to disable it earlier.
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This can be helpful in some corner cases where kdump and watchdog daemon
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both are active.
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Testing:
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-- When watchdog kernel modules were added
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# dracut --no-hostonly initramfs-test.img -a watchdog
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# lsinitrd initramfs-test.img -f etc/cmdline.d/00-watchdog.conf
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rd.driver.pre=iTCO_wdt,lpc_ich,
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Signed-off-by: Pratyush Anand <panand@redhat.com>
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Cc: Dave Young <dyoung@redhat.com>
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Cc: Don Zickus <dzickus@redhat.com>
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Cc: Harald Hoyer <harald@redhat.com>
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---
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modules.d/04watchdog/module-setup.sh | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/modules.d/04watchdog/module-setup.sh b/modules.d/04watchdog/module-setup.sh
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index 4680936f..6b35f9f5 100755
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--- a/modules.d/04watchdog/module-setup.sh
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+++ b/modules.d/04watchdog/module-setup.sh
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@@ -33,6 +33,7 @@ install() {
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installkernel() {
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[[ -d /sys/class/watchdog/ ]] || return
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+ wdtcmdline=""
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for dir in /sys/class/watchdog/*; do
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[[ -d "$dir" ]] || continue
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[[ -f "$dir/state" ]] || continue
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@@ -46,6 +47,7 @@ installkernel() {
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# represented by modalias
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wdtdrv=$(modprobe -R $wdtdrv)
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instmods $wdtdrv
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+ wdtcmdline="$wdtcmdline$(echo $wdtdrv | tr " " ","),"
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# however in some cases, we also need to check that if there is
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# a specific driver for the parent bus/device. In such cases
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# we also need to enable driver for parent bus/device.
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@@ -55,7 +57,10 @@ installkernel() {
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wdtpdrv=$(< "$wdtppath/modalias")
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wdtpdrv=$(modprobe -R $wdtpdrv)
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instmods $wdtpdrv
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+ wdtcmdline="$wdtcmdline$(echo $wdtpdrv | tr " " ","),"
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wdtppath=$(readlink -f "$wdtppath/..")
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done
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done
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+ # ensure that watchdog module is loaded as early as possible
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+ [[ $wdtcmdline = "" ]] || echo "rd.driver.pre=$wdtcmdline" > ${initdir}/etc/cmdline.d/00-watchdog.conf
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}
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