From 320bd209fe2ffdd9649ce4e4e7b8d910dd29c297 Mon Sep 17 00:00:00 2001
From: Kairui Song <kasong@redhat.com>
Date: Thu, 19 Nov 2020 17:06:58 +0800
Subject: [PATCH] Add a helper for detecting watchdog drivers

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Lianbo Jiang <lijiang@redhat.com>
---
 kdump-lib.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 748419f..43116a9 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -744,6 +744,25 @@ prepare_kdump_bootinfo()
     fi
 }
 
+get_watchdog_drvs()
+{
+    local _wdtdrvs _drv _dir
+
+    for _dir in /sys/class/watchdog/*; do
+        # device/modalias will return driver of this device
+        [[ -f "$_dir/device/modalias" ]] || continue
+        _drv=$(< "$_dir/device/modalias")
+        _drv=$(modprobe --set-version "$KDUMP_KERNELVER" -R $_drv 2>/dev/null)
+        for i in $_drv; do
+            if ! [[ " $_wdtdrvs " == *" $i "* ]]; then
+                _wdtdrvs="$_wdtdrvs $i"
+            fi
+        done
+    done
+
+    echo $_wdtdrvs
+}
+
 #
 # prepare_cmdline <commandline> <commandline remove> <commandline append>
 # This function performs a series of edits on the command line.