1 files changed, 33 insertions, 10 deletions

diff --git a/tools/testing/selftests/breakpoints/step_after_suspend_test.c b/tools/testing/selftests/breakpoints/step_after_suspend_test.c
index b8703c499d28..8d233ac95696 100644
--- a/tools/testing/selftests/breakpoints/step_after_suspend_test.c
+++ b/tools/testing/selftests/breakpoints/step_after_suspend_test.c
@@ -127,23 +127,42 @@ int run_test(int cpu)
 	return KSFT_PASS;
 }
 
+/*
+ * Reads the suspend success count from sysfs.
+ * Returns the count on success or exits on failure.
+ */
+static int get_suspend_success_count_or_fail(void)
+{
+	FILE *fp;
+	int val;
+
+	fp = fopen("/sys/power/suspend_stats/success", "r");
+	if (!fp)
+		ksft_exit_fail_msg(
+			"Failed to open suspend_stats/success: %s\n",
+			strerror(errno));
+
+	if (fscanf(fp, "%d", &val) != 1) {
+		fclose(fp);
+		ksft_exit_fail_msg(
+			"Failed to read suspend success count\n");
+	}
+
+	fclose(fp);
+	return val;
+}
+
 void suspend(void)
 {
-	int power_state_fd;
-	struct sigevent event = {};
 	int timerfd;
 	int err;
+	int count_before;
+	int count_after;
 	struct itimerspec spec = {};
 
 	if (getuid() != 0)
 		ksft_exit_skip("Please run the test as root - Exiting.\n");
 
-	power_state_fd = open("/sys/power/state", O_RDWR);
-	if (power_state_fd < 0)
-		ksft_exit_fail_msg(
-			"open(\"/sys/power/state\") failed %s)\n",
-			strerror(errno));
-
 	timerfd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
 	if (timerfd < 0)
 		ksft_exit_fail_msg("timerfd_create() failed\n");
@@ -153,11 +172,15 @@ void suspend(void)
 	if (err < 0)
 		ksft_exit_fail_msg("timerfd_settime() failed\n");
 
-	if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem"))
+	count_before = get_suspend_success_count_or_fail();
+
+	system("(echo mem > /sys/power/state) 2> /dev/null");
+
+	count_after = get_suspend_success_count_or_fail();
+	if (count_after <= count_before)
 		ksft_exit_fail_msg("Failed to enter Suspend state\n");
 
 	close(timerfd);
-	close(power_state_fd);
 }
 
 int main(int argc, char **argv)