[PATCH 4.16 187/272] hwmon: (pmbus/max8688) Accept negative page register values

Greg Kroah-Hartman
2018-05-28T11:34:52Z

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

[ Upstream commit a46f8cd696624ef757be0311eb28f119c36778e8 ]

A negative page register value means that no page needs to be
selected. This is used by status register evaluations and needs
to be accepted.

Fixes: da8e48ab483e1 ("hwmon: (pmbus) Always call _pmbus_read_byte in core driver")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/hwmon/pmbus/max8688.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/pmbus/max8688.c
+++ b/drivers/hwmon/pmbus/max8688.c
@@ -45,7 +45,7 @@ static int max8688_read_word_data(struct
{
int ret;

- if (page)
+ if (page > 0)
return -ENXIO;

switch (reg) {