linux-kernel - [PATCH 29/66] hwmon: (max197) use permission-specific DEVICE

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Message-Id: <1482408335-3435-30-git-send-email-Julia.Lawall@lip6.fr>
Date:   Thu, 22 Dec 2016 13:04:58 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Jean Delvare <jdelvare@...e.com>
Cc:     kernel-janitors@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 29/66] hwmon: (max197) use permission-specific DEVICE_ATTR variants

Use DEVICE_ATTR_RO etc. for read only attributes etc.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The semantic patch for the RO case, in the case where the show function
already has the expected name, is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@ro@
declarer name DEVICE_ATTR;
identifier x,x_show;
@@

DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);

@script:ocaml@
x << ro.x;
x_show << ro.x_show;
@@

if not (x^"_show" = x_show) then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RO;
identifier ro.x,ro.x_show;
@@

- DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);
+ DEVICE_ATTR_RO(x);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/hwmon/max197.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/max197.c b/drivers/hwmon/max197.c
index 0762856..638567f 100644
--- a/drivers/hwmon/max197.c
+++ b/drivers/hwmon/max197.c
@@ -207,8 +207,8 @@ static ssize_t max197_show_input(struct device *dev,
 	return ret;
 }
 
-static ssize_t max197_show_name(struct device *dev,
-				struct device_attribute *attr, char *buf)
+static ssize_t name_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	return sprintf(buf, "%s\n", pdev->name);
@@ -231,7 +231,7 @@ static ssize_t max197_show_name(struct device *dev,
 	&sensor_dev_attr_in##chan##_max.dev_attr.attr,			\
 	&sensor_dev_attr_in##chan##_min.dev_attr.attr
 
-static DEVICE_ATTR(name, S_IRUGO, max197_show_name, NULL);
+static DEVICE_ATTR_RO(name);
 
 MAX197_SENSOR_DEVICE_ATTR_CH(0);
 MAX197_SENSOR_DEVICE_ATTR_CH(1);