On Wed, May 29, 2019 at 02:33:52PM +0000, Adamski, Krzysztof (Nokia - PL/Wroclaw) wrote: > update_lock is a mutex intended to protect write operations. It was not > taken, however, when _pmbus_write_word_data is called from > pmbus_set_samples() function which may cause problems especially when > some PMBUS_VIRT_* operation is implemented as a read-modify-write cycle. > > This patch makes sure the lock is held during the operation. > > Signed-off-by: Krzysztof Adamski <krzysztof.adamski@xxxxxxxxx> > Reviewed-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx> Applied. Thanks, Guenter > --- > drivers/hwmon/pmbus/pmbus_core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c > index ef7ee90ee785..62cd213cc260 100644 > --- a/drivers/hwmon/pmbus/pmbus_core.c > +++ b/drivers/hwmon/pmbus/pmbus_core.c > @@ -1946,7 +1946,9 @@ static ssize_t pmbus_set_samples(struct device *dev, > if (kstrtol(buf, 0, &val) < 0) > return -EINVAL; > > + mutex_lock(&data->update_lock); > ret = _pmbus_write_word_data(client, reg->page, reg->attr->reg, val); > + mutex_unlock(&data->update_lock); > > return ret ? : count; > }
