[PATCH 4.16 188/272] hwmon: (pmbus/adm1275) Accept negative page register values

Greg Kroah-Hartman
2018-05-28T11:13:43Z

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

[ Upstream commit ecb29abd4cb0670c616fb563a078f25d777ce530 ]

A negative page register value means that no page needs to be
selected. This is used by status register read operations and needs
to be accepted. The failure to do so so results in missed status
and limit registers.

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/adm1275.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -154,7 +154,7 @@ static int adm1275_read_word_data(struct
const struct adm1275_data *data = to_adm1275_data(info);
int ret = 0;

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

switch (reg) {
@@ -240,7 +240,7 @@ static int adm1275_write_word_data(struc
const struct adm1275_data *data = to_adm1275_data(info);
int ret;

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

switch (reg) {