linux-kernel - [PATCH 54/66] hwmon: (nct6775) use permission-specific DEVICE

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Date:   Thu, 22 Dec 2016 13:05:23 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     kernel-janitors@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 54/66] hwmon: (nct6775) 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/nct6775.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index ce75dd4..2458b40 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -3127,14 +3127,14 @@ static umode_t nct6775_pwm_is_visible(struct kobject *kobj,
 };
 
 static ssize_t
-show_vid(struct device *dev, struct device_attribute *attr, char *buf)
+cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct nct6775_data *data = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 }
 
-static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
+static DEVICE_ATTR_RO(cpu0_vid);
 
 /* Case open detection */