linux-kernel - [PATCH 65/66] hwmon: (fam15h_power) use permission-specific DEVICE

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Date:   Thu, 22 Dec 2016 13:05:34 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Huang Rui <ray.huang@....com>
Cc:     kernel-janitors@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 65/66] hwmon: (fam15h_power) 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/fam15h_power.c |   34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index 15aa49d..9545a34 100644
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -83,8 +83,8 @@ static bool is_carrizo_or_later(void)
 	return boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model >= 0x60;
 }
 
-static ssize_t show_power(struct device *dev,
-			  struct device_attribute *attr, char *buf)
+static ssize_t power1_input_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
 {
 	u32 val, tdp_limit, running_avg_range;
 	s32 running_avg_capture;
@@ -136,16 +136,16 @@ static ssize_t show_power(struct device *dev,
 	curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
 	return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
 }
-static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
+static DEVICE_ATTR_RO(power1_input);
 
-static ssize_t show_power_crit(struct device *dev,
-			       struct device_attribute *attr, char *buf)
+static ssize_t power1_crit_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
 {
 	struct fam15h_power_data *data = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%u\n", data->processor_pwr_watts);
 }
-static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
+static DEVICE_ATTR_RO(power1_crit);
 
 static void do_read_registers_on_cu(void *_data)
 {
@@ -212,9 +212,8 @@ static int read_registers(struct fam15h_power_data *data)
 	return 0;
 }
 
-static ssize_t acc_show_power(struct device *dev,
-			      struct device_attribute *attr,
-			      char *buf)
+static ssize_t power1_average_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
 {
 	struct fam15h_power_data *data = dev_get_drvdata(dev);
 	u64 prev_cu_acc_power[MAX_CUS], prev_ptsc[MAX_CUS],
@@ -267,20 +266,20 @@ static ssize_t acc_show_power(struct device *dev,
 
 	return sprintf(buf, "%llu\n", (unsigned long long)avg_acc);
 }
-static DEVICE_ATTR(power1_average, S_IRUGO, acc_show_power, NULL);
+static DEVICE_ATTR_RO(power1_average);
 
-static ssize_t acc_show_power_period(struct device *dev,
-				     struct device_attribute *attr,
-				     char *buf)
+static ssize_t power1_average_interval_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf)
 {
 	struct fam15h_power_data *data = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%lu\n", data->power_period);
 }
 
-static ssize_t acc_set_power_period(struct device *dev,
-				    struct device_attribute *attr,
-				    const char *buf, size_t count)
+static ssize_t power1_average_interval_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
 {
 	struct fam15h_power_data *data = dev_get_drvdata(dev);
 	unsigned long temp;
@@ -301,8 +300,7 @@ static ssize_t acc_set_power_period(struct device *dev,
 
 	return count;
 }
-static DEVICE_ATTR(power1_average_interval, S_IRUGO | S_IWUSR,
-		   acc_show_power_period, acc_set_power_period);
+static DEVICE_ATTR_RW(power1_average_interval);
 
 static int fam15h_power_init_attrs(struct pci_dev *pdev,
 				   struct fam15h_power_data *data)