[PATCH 3.16 034/366] hwmon: (pmbus/adm1275) Accept negative page register values

Ben Hutchings
2018-10-14T23:31:00Z

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

commit ecb29abd4cb0670c616fb563a078f25d777ce530 upstream.

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: Ben Hutchings <ben@decadent.org.uk>
---
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
@@ -67,7 +67,7 @@ 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) {
@@ -144,7 +144,7 @@ static int adm1275_write_word_data(struc
{
int ret;

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

switch (reg) {