linux-kernel - [PATCH 4.4 102/190] rtc: opal: Handle disabled TPO in opal_get_tpo

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Message-Id: <20180411183556.536661881@linuxfoundation.org>
Date:   Wed, 11 Apr 2018 20:35:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>,
        Steve Best <sbest@...hat.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 102/190] rtc: opal: Handle disabled TPO in opal_get_tpo_time()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>

[ 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@...ux.vnet.ibm.com>
Reported-by: Steve Best <sbest@...hat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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: