[PATCH 2/4] selftests: timers: rtcpie: restore previous PIE rate

Alexandre Belloni
2018-04-19T12:50:55Z

After the test ends, restore the PIE rate to its previous value to be less
disruptive.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
tools/testing/selftests/timers/rtcpie.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/timers/rtcpie.c b/tools/testing/selftests/timers/rtcpie.c
index ea98b1f6ac17..47b5bad1b393 100644
--- a/tools/testing/selftests/timers/rtcpie.c
+++ b/tools/testing/selftests/timers/rtcpie.c
@@ -28,7 +28,7 @@ static const char default_rtc[] = "/dev/rtc0";
int main(int argc, char **argv)
{
int i, fd, retval, irqcount = 0;
- unsigned long tmp, data;
+ unsigned long tmp, data, old_pie_rate;
const char *rtc = default_rtc;
struct timeval start, end, diff;

@@ -51,7 +51,7 @@ int main(int argc, char **argv)
}

/* Read periodic IRQ rate */
- retval = ioctl(fd, RTC_IRQP_READ, &tmp);
+ retval = ioctl(fd, RTC_IRQP_READ, &old_pie_rate);
if (retval == -1) {
/* not all RTCs support periodic IRQs */
if (errno == EINVAL) {
@@ -61,7 +61,7 @@ int main(int argc, char **argv)
perror("RTC_IRQP_READ ioctl");
exit(errno);
}
- fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", tmp);
+ fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", old_pie_rate);

fprintf(stderr, "Counting 20 interrupts at:");
fflush(stderr);
@@ -124,6 +124,8 @@ int main(int argc, char **argv)
}

done:
+ ioctl(fd, RTC_IRQP_SET, old_pie_rate);
+
fprintf(stderr, "\n\n\t\t\t *** Test complete ***\n");

close(fd);
--
2.17.0