linux-kernel - [PATCH AUTOSEL 5.6 06/38] hwmon: (drivetemp) Return -ENODATA for invalid temperatures

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Message-Id: <20200424122237.9831-6-sashal@kernel.org>
Date:   Fri, 24 Apr 2020 08:22:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Holger Hoffstätte 
        <holger@...lied-asynchrony.com>, Sasha Levin <sashal@...nel.org>,
        linux-hwmon@...r.kernel.org
Subject: [PATCH AUTOSEL 5.6 06/38] hwmon: (drivetemp) Return -ENODATA for invalid temperatures

From: Guenter Roeck <linux@...ck-us.net>

[ Upstream commit ed08ebb7124e90a99420bb913d602907d377d03d ]

Holger Hoffstätte observed that Samsung 850 Pro may return invalid
temperatures for a short period of time after resume. Return -ENODATA
to userspace if this is observed.

Fixes:  5b46903d8bf3 ("hwmon: Driver for disk and solid state drives with temperature sensors")
Reported-by: Holger Hoffstätte <holger@...lied-asynchrony.com>
Cc: Holger Hoffstätte <holger@...lied-asynchrony.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/drivetemp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwmon/drivetemp.c b/drivers/hwmon/drivetemp.c
index 370d0c74eb012..9179460c2d9d5 100644
--- a/drivers/hwmon/drivetemp.c
+++ b/drivers/hwmon/drivetemp.c
@@ -264,12 +264,18 @@ static int drivetemp_get_scttemp(struct drivetemp_data *st, u32 attr, long *val)
 		return err;
 	switch (attr) {
 	case hwmon_temp_input:
+		if (!temp_is_valid(buf[SCT_STATUS_TEMP]))
+			return -ENODATA;
 		*val = temp_from_sct(buf[SCT_STATUS_TEMP]);
 		break;
 	case hwmon_temp_lowest:
+		if (!temp_is_valid(buf[SCT_STATUS_TEMP_LOWEST]))
+			return -ENODATA;
 		*val = temp_from_sct(buf[SCT_STATUS_TEMP_LOWEST]);
 		break;
 	case hwmon_temp_highest:
+		if (!temp_is_valid(buf[SCT_STATUS_TEMP_HIGHEST]))
+			return -ENODATA;
 		*val = temp_from_sct(buf[SCT_STATUS_TEMP_HIGHEST]);
 		break;
 	default:
-- 
2.20.1