selftest: rtc: Check if could access /dev/rtc0 before testing

The rtctest requires the read permission on /dev/rtc0. The rtctest will
be skipped if the /dev/rtc0 is not readable.

Reviewed-by: Koba Ko <kobak@nvidia.com>
Reviewed-by: Matthew R. Ochs <mochs@nvidia.com>
Signed-off-by: Joseph Jang <jjang@nvidia.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/rtc/rtctest.c b/tools/testing/selftests/rtc/rtctest.c
index 9647b14b47c59e5d0ac603de9b7fb9b18072db29..38a8e67de77d6f7ce196f78051f0170badc8054e 100644 (file)
--- a/tools/testing/selftests/rtc/rtctest.c
+++ b/tools/testing/selftests/rtc/rtctest.c
@@ -412,6 +412,8 @@ TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
 
 int main(int argc, char **argv)
 {
+       int ret = -1;
+
        switch (argc) {
        case 2:
                rtc_file = argv[1];
@@ -423,5 +425,12 @@ int main(int argc, char **argv)
                return 1;
        }
 
-       return test_harness_run(argc, argv);
+       /* Run the test if rtc_file is accessible */
+       if (access(rtc_file, R_OK) == 0)
+               ret = test_harness_run(argc, argv);
+       else
+               ksft_exit_skip("[SKIP]: Cannot access rtc file %s - Exiting\n",
+                                               rtc_file);
+
+       return ret;
 }