4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vaibhav Jain <vaibhav@xxxxxxxxxxxxxxxxxx>
[ Upstream commit 6dc1cf6f932bb0ea4d8f5e913a0a401ecacd2f03 ]
On PowerNV platform when Timed-Power-On(TPO) is disabled, read of
stored TPO yields value with all date components set to '0' inside
opal_get_tpo_time(). The function opal_to_tm() then converts it to an
offset from year 1900 yielding alarm-time == "1900-00-01
00:00:00". This causes problems with __rtc_read_alarm() that
expecting an offset from "1970-00-01 00:00:00" and returned alarm-time
results in a -ve value for time64_t. Which ultimately results in this
error reported in kernel logs with a seemingly garbage value:
"rtc rtc0: invalid alarm value: -2-1--1041528741
2005511117:71582844:32"
We fix this by explicitly handling the case of all alarm date-time
components being '0' inside opal_get_tpo_time() and returning -ENOENT
in such a case. This signals generic rtc that no alarm is set and it
bails out from the alarm initialization flow without reporting the
above error.
Signed-off-by: Vaibhav Jain <vaibhav@xxxxxxxxxxxxxxxxxx>
Reported-by: Steve Best <sbest@xxxxxxxxxx>
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-opal.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/rtc/rtc-opal.c
+++ b/drivers/rtc/rtc-opal.c
@@ -150,6 +150,16 @@ static int opal_get_tpo_time(struct devi
y_m_d = be32_to_cpu(__y_m_d);
h_m_s_ms = ((u64)be32_to_cpu(__h_m) << 32);
+
+ /* check if no alarm is set */
+ if (y_m_d == 0 && h_m_s_ms == 0) {
+ pr_debug("No alarm is set\n");
+ rc = -ENOENT;
+ goto exit;
+ } else {
+ pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
+ }
+
opal_to_tm(y_m_d, h_m_s_ms, &alarm->time);
exit: