From 98e193529318119e1d16f2efa6ae280fe39b7294 Mon Sep 17 00:00:00 2001
From: Tao Liu <ltao@redhat.com>
Date: Nov 09 2021 12:48:26 +0000
Subject: Don't iterate the whole /sys/devices just to find drm device


upstream: fedora
resolves: bz2003832
conflict: none

commit c6021648f1db52a5e2eee31ec409efe468fe5af2
Author: Kairui Song <kasong@redhat.com>
Date:   Fri Mar 19 18:21:11 2021 +0800

    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>

Signed-off-by: Tao Liu <ltao@redhat.com>

---

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 5918484..68b2874 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -45,7 +45,7 @@ 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