Merge pull request #121 from dracut-mailing-devs/2751555c29f26f69a63888745513edeceb39d416.1458099200.git.panand@redhat.com

Install kernel module for active watchdog

modules.d/04watchdog/module-setup.sh

@@ -12,6 +12,11 @@ depends() {
 
 # called by dracut
 install() {
+    # Do not add watchdog hooks if systemd module is included
+    # In that case, systemd will manage watchdog kick
+    if dracut_module_included "systemd"; then
+	    return
+    fi
     inst_hook cmdline   00 "$moddir/watchdog.sh"
     inst_hook cmdline   50 "$moddir/watchdog.sh"
     inst_hook pre-trigger 00 "$moddir/watchdog.sh"
@@ -27,3 +32,36 @@ install() {
     inst_multiple -o wdctl
 }
 
+installkernel() {
+    [[ -d /sys/class/watchdog/ ]] || return
+    wdtcmdline=""
+    for dir in /sys/class/watchdog/*; do
+	    [[ -d "$dir" ]] || continue
+	    [[ -f "$dir/state" ]] || continue
+	    active=$(< "$dir/state")
+	    ! [[ $hostonly ]] || [[ "$active" =  "active" ]] || continue
+	    # device/modalias will return driver of this device
+	    wdtdrv=$(< "$dir/device/modalias")
+	    # There can be more than one module represented by same
+	    # modalias. Currently load all of them.
+	    # TODO: Need to find a way to avoid any unwanted module
+	    # represented by modalias
+	    wdtdrv=$(modprobe -R $wdtdrv)
+	    instmods $wdtdrv
+	    wdtcmdline="$wdtcmdline$(echo $wdtdrv | tr " " ","),"
+	    # however in some cases, we also need to check that if there is
+	    # a specific driver for the parent bus/device.  In such cases
+	    # we also need to enable driver for parent bus/device.
+	    wdtppath=$(readlink -f "$dir/device/..")
+	    while [ -f "$wdtppath/modalias" ]
+	    do
+		    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
+}