[PATCH] w1: cleanups.
- white space changes.
- list_for_each_entry/list_for_each_entry_safe and reverse changes.
- small coding style changes.
- removed redundant NULL checks.
- use attribute group and macros instead of direct device attributes.
Patch is havily based on work from Adrian Bunk and Dmitry Torokhov,
thanks guys.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 24a192e..5b49c9a 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -1,8 +1,8 @@
/*
- * w1.c
+ * w1.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -99,6 +99,23 @@
return sprintf(buf, "No family registered.\n");
}
+static struct device_attribute w1_slave_attribute =
+ __ATTR(name, S_IRUGO, w1_default_read_name, NULL);
+
+static struct device_attribute w1_slave_attribute_val =
+ __ATTR(value, S_IRUGO, w1_default_read_name, NULL);
+
+static struct bin_attribute w1_slave_bin_attribute = {
+ .attr = {
+ .name = "w1_slave",
+ .mode = S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = W1_SLAVE_DATA_SIZE,
+ .read = &w1_default_read_bin,
+};
+
+
static struct bus_type w1_bus_type = {
.name = "w1",
.match = w1_master_match,
@@ -119,34 +136,16 @@
.release = &w1_master_release
};
-static struct device_attribute w1_slave_attribute = {
- .attr = {
- .name = "name",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_default_read_name,
-};
-
-static struct device_attribute w1_slave_attribute_val = {
- .attr = {
- .name = "value",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_default_read_name,
-};
-
static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_master *md = container_of (dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible (&md->mutex))
return -EBUSY;
count = sprintf(buf, "%s\n", md->name);
-
+
up(&md->mutex);
return count;
@@ -156,12 +155,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "0x%p\n", md->bus_master);
-
+
up(&md->mutex);
return count;
}
@@ -177,12 +176,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%d\n", md->max_slave_count);
-
+
up(&md->mutex);
return count;
}
@@ -191,12 +190,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%lu\n", md->attempts);
-
+
up(&md->mutex);
return count;
}
@@ -205,12 +204,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%d\n", md->slave_count);
-
+
up(&md->mutex);
return count;
}
@@ -233,7 +232,7 @@
list_for_each_safe(ent, n, &md->slist) {
sl = list_entry(ent, struct w1_slave, w1_slave_entry);
- c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
}
}
@@ -242,73 +241,44 @@
return PAGE_SIZE - c;
}
-static struct device_attribute w1_master_attribute_slaves = {
- .attr = {
- .name = "w1_master_slaves",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .show = &w1_master_attribute_show_slaves,
-};
-static struct device_attribute w1_master_attribute_slave_count = {
- .attr = {
- .name = "w1_master_slave_count",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_slave_count,
-};
-static struct device_attribute w1_master_attribute_attempts = {
- .attr = {
- .name = "w1_master_attempts",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_attempts,
-};
-static struct device_attribute w1_master_attribute_max_slave_count = {
- .attr = {
- .name = "w1_master_max_slave_count",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_max_slave_count,
-};
-static struct device_attribute w1_master_attribute_timeout = {
- .attr = {
- .name = "w1_master_timeout",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_timeout,
-};
-static struct device_attribute w1_master_attribute_pointer = {
- .attr = {
- .name = "w1_master_pointer",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_pointer,
-};
-static struct device_attribute w1_master_attribute_name = {
- .attr = {
- .name = "w1_master_name",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_name,
+#define W1_MASTER_ATTR_RO(_name, _mode) \
+ struct device_attribute w1_master_attribute_##_name = \
+ __ATTR(w1_master_##_name, _mode, \
+ w1_master_attribute_show_##_name, NULL)
+
+static W1_MASTER_ATTR_RO(name, S_IRUGO);
+static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
+static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
+static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
+static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
+static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
+static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
+
+static struct attribute *w1_master_default_attrs[] = {
+ &w1_master_attribute_name.attr,
+ &w1_master_attribute_slaves.attr,
+ &w1_master_attribute_slave_count.attr,
+ &w1_master_attribute_max_slave_count.attr,
+ &w1_master_attribute_attempts.attr,
+ &w1_master_attribute_timeout.attr,
+ &w1_master_attribute_pointer.attr,
+ NULL
};
-static struct bin_attribute w1_slave_bin_attribute = {
- .attr = {
- .name = "w1_slave",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .size = W1_SLAVE_DATA_SIZE,
- .read = &w1_default_read_bin,
+static struct attribute_group w1_master_defattr_group = {
+ .attrs = w1_master_default_attrs,
};
+int w1_create_master_attributes(struct w1_master *master)
+{
+ return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
+}
+
+void w1_destroy_master_attributes(struct w1_master *master)
+{
+ sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
+}
+
static int __w1_attach_slave_device(struct w1_slave *sl)
{
int err;
@@ -341,7 +311,7 @@
memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin));
memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name));
memcpy(&sl->attr_val, &w1_slave_attribute_val, sizeof(sl->attr_val));
-
+
sl->attr_bin.read = sl->family->fops->rbin;
sl->attr_name.show = sl->family->fops->rname;
sl->attr_val.show = sl->family->fops->rval;
@@ -445,7 +415,7 @@
static void w1_slave_detach(struct w1_slave *sl)
{
struct w1_netlink_msg msg;
-
+
dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name);
while (atomic_read(&sl->refcnt)) {
@@ -471,8 +441,8 @@
{
struct w1_master *dev;
int found = 0;
-
- spin_lock_irq(&w1_mlock);
+
+ spin_lock_bh(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
@@ -480,12 +450,12 @@
break;
}
}
- spin_unlock_irq(&w1_mlock);
+ spin_unlock_bh(&w1_mlock);
return (found)?dev:NULL;
}
-void w1_slave_found(unsigned long data, u64 rn)
+static void w1_slave_found(unsigned long data, u64 rn)
{
int slave_count;
struct w1_slave *sl;
@@ -500,7 +470,7 @@
data);
return;
}
-
+
tmp = (struct w1_reg_num *) &rn;
slave_count = 0;
@@ -513,8 +483,7 @@
sl->reg_num.crc == tmp->crc) {
set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
break;
- }
- else if (sl->reg_num.family == tmp->family) {
+ } else if (sl->reg_num.family == tmp->family) {
family_found = 1;
break;
}
@@ -528,7 +497,7 @@
rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) {
w1_attach_slave_device(dev, tmp);
}
-
+
atomic_dec(&dev->refcnt);
}
@@ -545,8 +514,8 @@
desc_bit = 64;
- while (!(id_bit && comp_bit) && !last_device
- && count++ < dev->max_slave_count) {
+ while (!(id_bit && comp_bit) && !last_device &&
+ count++ < dev->max_slave_count) {
last = rn;
rn = 0;
@@ -591,8 +560,7 @@
last_family_desc = last_zero;
}
- }
- else
+ } else
search_bit = id_bit;
tmp = search_bit;
@@ -615,42 +583,15 @@
last_device = 1;
desc_bit = last_zero;
-
+
w1_slave_found(dev->bus_master->data, rn);
}
}
-int w1_create_master_attributes(struct w1_master *dev)
+static int w1_control(void *data)
{
- if ( device_create_file(&dev->dev, &w1_master_attribute_slaves) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_slave_count) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_attempts) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_max_slave_count) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_timeout) < 0||
- device_create_file(&dev->dev, &w1_master_attribute_pointer) < 0||
- device_create_file(&dev->dev, &w1_master_attribute_name) < 0)
- return -EINVAL;
-
- return 0;
-}
-
-void w1_destroy_master_attributes(struct w1_master *dev)
-{
- device_remove_file(&dev->dev, &w1_master_attribute_slaves);
- device_remove_file(&dev->dev, &w1_master_attribute_slave_count);
- device_remove_file(&dev->dev, &w1_master_attribute_attempts);
- device_remove_file(&dev->dev, &w1_master_attribute_max_slave_count);
- device_remove_file(&dev->dev, &w1_master_attribute_timeout);
- device_remove_file(&dev->dev, &w1_master_attribute_pointer);
- device_remove_file(&dev->dev, &w1_master_attribute_name);
-}
-
-
-int w1_control(void *data)
-{
- struct w1_slave *sl;
- struct w1_master *dev;
- struct list_head *ent, *ment, *n, *mn;
+ struct w1_slave *sl, *sln;
+ struct w1_master *dev, *n;
int err, have_to_wait = 0;
daemonize("w1_control");
@@ -665,9 +606,7 @@
if (signal_pending(current))
flush_signals(current);
- list_for_each_safe(ment, mn, &w1_masters) {
- dev = list_entry(ment, struct w1_master, w1_master_entry);
-
+ list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
if (!control_needs_exit && !dev->need_exit)
continue;
/*
@@ -679,9 +618,9 @@
continue;
}
- spin_lock(&w1_mlock);
+ spin_lock_bh(&w1_mlock);
list_del(&dev->w1_master_entry);
- spin_unlock(&w1_mlock);
+ spin_unlock_bh(&w1_mlock);
if (control_needs_exit) {
dev->need_exit = 1;
@@ -695,19 +634,11 @@
wait_for_completion(&dev->dev_exited);
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ list_del(&sl->w1_slave_entry);
- if (!sl)
- dev_warn(&dev->dev,
- "%s: slave entry is NULL.\n",
- __func__);
- else {
- list_del(&sl->w1_slave_entry);
-
- w1_slave_detach(sl);
- kfree(sl);
- }
+ w1_slave_detach(sl);
+ kfree(sl);
}
w1_destroy_master_attributes(dev);
atomic_dec(&dev->refcnt);
@@ -720,8 +651,7 @@
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
- struct list_head *ent, *n;
- struct w1_slave *sl;
+ struct w1_slave *sl, *sln;
daemonize("%s", dev->name);
allow_signal(SIGTERM);
@@ -742,27 +672,20 @@
if (down_interruptible(&dev->mutex))
continue;
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
-
- if (sl)
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry)
clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
- }
-
+
w1_search_devices(dev, w1_slave_found);
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
-
- if (sl && !test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
list_del (&sl->w1_slave_entry);
w1_slave_detach (sl);
kfree (sl);
dev->slave_count--;
- }
- else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
sl->ttl = dev->slave_ttl;
}
up(&dev->mutex);
@@ -774,7 +697,7 @@
return 0;
}
-int w1_init(void)
+static int w1_init(void)
{
int retval;
@@ -814,18 +737,14 @@
return retval;
}
-void w1_fini(void)
+static void w1_fini(void)
{
struct w1_master *dev;
- struct list_head *ent, *n;
- list_for_each_safe(ent, n, &w1_masters) {
- dev = list_entry(ent, struct w1_master, w1_master_entry);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry)
__w1_remove_master_device(dev);
- }
control_needs_exit = 1;
-
wait_for_completion(&w1_control_complete);
driver_unregister(&w1_driver);