efivarfs:efivarfs.sh from ubuntu_kernel_selftests failed with "Read-only file system" on M-starfive

[Po-Hsu Lin]

Issue found on M-starfive 6.5.0-1005.6 and 6.5.0-1007.8

Test log:
 Running 'make run_tests -C efivarfs TEST_PROGS=efivarfs.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
 make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/efivarfs'
 TAP version 13
 1..1
 # timeout set to 45
 # selftests: efivarfs: efivarfs.sh
 # --------------------
 # running test_create
 # --------------------
 # ./efivarfs.sh: line 58: /sys/firmware/efi/efivars/test_create-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/test_create-210be57c-9849-4fc7-a635-e6382d1aec27 couldn't be created
 # [FAIL]
 # --------------------
 # running test_create_empty
 # --------------------
 # ./efivarfs.sh: line 77: /sys/firmware/efi/efivars/test_create_empty-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/test_create_empty-210be57c-9849-4fc7-a635-e6382d1aec27 can not be created without writing
 # [FAIL]
 # --------------------
 # running test_create_read
 # --------------------
 # open(O_WRONLY): Read-only file system
 # create and read /sys/firmware/efi/efivars/test_create_read-210be57c-9849-4fc7-a635-e6382d1aec27 failed
 # chattr: No such file or directory while trying to stat /sys/firmware/efi/efivars/test_create_read-210be57c-9849-4fc7-a635-e6382d1aec27
 # [FAIL]
 # --------------------
 # running test_delete
 # --------------------
 # ./efivarfs.sh: line 103: /sys/firmware/efi/efivars/test_delete-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/test_delete-210be57c-9849-4fc7-a635-e6382d1aec27 couldn't be created
 # [FAIL]
 # --------------------
 # running test_zero_size_delete
 # --------------------
 # ./efivarfs.sh: line 126: /sys/firmware/efi/efivars/test_zero_size_delete-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/test_zero_size_delete-210be57c-9849-4fc7-a635-e6382d1aec27 does not exist
 # [FAIL]
 # --------------------
 # running test_open_unlink
 # --------------------
 # open(O_WRONLY): Read-only file system
 # [FAIL]
 # --------------------
 # running test_valid_filenames
 # --------------------
 # ./efivarfs.sh: line 158: /sys/firmware/efi/efivars/abc-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/abc-210be57c-9849-4fc7-a635-e6382d1aec27 could not be created
 # ./efivarfs.sh: line 158: /sys/firmware/efi/efivars/dump-type0-11-1-1362436005-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/dump-type0-11-1-1362436005-210be57c-9849-4fc7-a635-e6382d1aec27 could not be created
 # ./efivarfs.sh: line 158: /sys/firmware/efi/efivars/1234-210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/1234-210be57c-9849-4fc7-a635-e6382d1aec27 could not be created
 # ./efivarfs.sh: line 158: /sys/firmware/efi/efivars/--210be57c-9849-4fc7-a635-e6382d1aec27: Read-only file system
 # /sys/firmware/efi/efivars/--210be57c-9849-4fc7-a635-e6382d1aec27 could not be created
 # [FAIL]
 # --------------------
 # running test_invalid_filenames
 # --------------------
 # [PASS]
 not ok 1 selftests: efivarfs: efivarfs.sh # exit=1