selftests: efivarfs: remove the test_create_read file if it was exist

After the first run, the test case 'test_create_read' will always
fail because the file is exist and file's attr is 'S_IMMUTABLE',
open with 'O_RDWR' will always return -EPERM.

Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Shuah Khan <shuah@kernel.org>

diff --git a/tools/testing/selftests/efivarfs/efivarfs.sh b/tools/testing/selftests/efivarfs/efivarfs.sh
index a47029a..d386610 100755 (executable)
--- a/tools/testing/selftests/efivarfs/efivarfs.sh
+++ b/tools/testing/selftests/efivarfs/efivarfs.sh
@@ -77,6 +77,10 @@ test_create_empty()
 test_create_read()
 {
        local file=$efivarfs_mount/$FUNCNAME-$test_guid
+       if [ -f $file]; then
+               chattr -i $file
+               rm -rf $file
+       fi
        ./create-read $file
 }