From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Date: Thu, 17 Aug 2017 13:56:11 +0000 (+0200)
Subject: iio: magnetometer: ak8974: mark INT_CLEAR as precious
X-Git-Tag: v4.14-rc1~148^2~228^2~15
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9991f99eed49047c237e08471ce010cae02052fe;p=thirdparty%2Fkernel%2Flinux.git

iio: magnetometer: ak8974: mark INT_CLEAR as precious

Reading INT_CLEAR has side effects - disallow reading it via debugfs.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---

diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c
index b1c209faf1b12..866f20b818b18 100644
--- a/drivers/iio/magnetometer/ak8974.c
+++ b/drivers/iio/magnetometer/ak8974.c
@@ -661,11 +661,17 @@ static bool ak8974_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
+static bool ak8974_precious_reg(struct device *dev, unsigned int reg)
+{
+	return reg == AK8974_INT_CLEAR;
+}
+
 static const struct regmap_config ak8974_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 0xff,
 	.writeable_reg = ak8974_writeable_reg,
+	.precious_reg = ak8974_precious_reg,
 };
 
 static int ak8974_probe(struct i2c_client *i2c,