From c6021648f1db52a5e2eee31ec409efe468fe5af2 Mon Sep 17 00:00:00 2001
From: Kairui Song <kasong@redhat.com>
Date: Fri, 19 Mar 2021 18:21:11 +0800
Subject: [PATCH] Don't iterate the whole /sys/devices just to find drm device

On some large systems, /sys/devices is huge and it's not a wise idea to
iterate it. `find` may cause tremendous contention on the kernfs_mutex
when there are already stress on /sys, and it will perform very very
poorly.

Simply check if drm class presents should be good enough.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Pingfan Liu <piliu@redhat.com>
---
 dracut-module-setup.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 8316589..affd711 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -58,7 +58,7 @@ depends() {
         _dep="$_dep znet"
     fi
 
-    if [ -n "$( find /sys/devices -name drm )" ] || [ -d /sys/module/hyperv_fb ]; then
+    if [ -n "$( ls -A /sys/class/drm 2>/dev/null )" ] || [ -d /sys/module/hyperv_fb ]; then
         add_opt_module drm
     fi