Revert "mkdumprd: omit dracut modules in case of no dm target"

This reverts commit 821d1af080.

We are going to add "--no-hostonly-default-device" dracut argument
in the following patch.

With the help of "--no-hostonly-default-device", dracut only
adds the dump target as host devices, which naturally guarantees
only required dracut modules being selected.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

mkdumprd

@@ -359,44 +359,16 @@ check_crypt()
     return 1
 }
 
-is_dm()
-{
-    if [ -d "/sys/dev/block/$1/dm" ]; then
-        return 0
-    fi
-
-    return 1
-}
-
 crypt_exists=0
 omit_dracut_modules()
 {
-    local target majmin
-    local dm_exists
-
     # Skip fadump case
     is_fadump_capable && return
 
-    dm_exists=0
-
-    for target in $(get_kdump_targets); do
-        if [ -b "$target" ]; then
-            majmin=$(get_maj_min $target)
-            # Check "dm"
-            check_block_and_slaves is_dm $majmin && dm_exists=1
-        fi
-    done
-
     # Omit "crypt", BZ1451717
     if [ "$crypt_exists" == "0" ]; then
         add_dracut_arg "--omit" "crypt"
     fi
-
-    # Further omit more modules in case of no dm related target
-    if [ "$dm_exists" == "0" ]; then
-        # "dm_exists=0" implies "crypt_exists=0"
-        add_dracut_arg "--omit" "lvm dm multipath dmraid"
-    fi
 }
 
 if ! check_resettable; then