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path: root/drivers/w1/w1.c
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Diffstat (limited to 'drivers/w1/w1.c')
-rw-r--r--drivers/w1/w1.c114
1 files changed, 39 insertions, 75 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 32d8de881f11..420be14c2f8e 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -54,7 +54,7 @@ module_param_named(control_timeout, w1_control_timeout, int, 0);
module_param_named(max_slave_count, w1_max_slave_count, int, 0);
module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
-DECLARE_MUTEX(w1_mlock);
+DEFINE_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);
static struct task_struct *w1_control_thread;
@@ -139,11 +139,7 @@ static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, siz
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
- if (down_interruptible(&sl->master->mutex)) {
- count = 0;
- goto out;
- }
-
+ mutex_lock(&sl->master->mutex);
if (w1_reset_select_slave(sl)) {
count = 0;
goto out_up;
@@ -152,8 +148,7 @@ static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, siz
w1_write_block(sl->master, buf, count);
out_up:
- up(&sl->master->mutex);
-out:
+ mutex_unlock(&sl->master->mutex);
return count;
}
@@ -161,15 +156,9 @@ static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
- if (down_interruptible(&sl->master->mutex)) {
- count = 0;
- goto out;
- }
-
+ mutex_lock(&sl->master->mutex);
w1_read_block(sl->master, buf, count);
-
- up(&sl->master->mutex);
-out:
+ mutex_unlock(&sl->master->mutex);
return count;
}
@@ -243,12 +232,9 @@ static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_a
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible (&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%s\n", md->name);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -259,12 +245,9 @@ static ssize_t w1_master_attribute_store_search(struct device * dev,
{
struct w1_master *md = dev_to_w1_master(dev);
- if (down_interruptible (&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
md->search_count = simple_strtol(buf, NULL, 0);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -276,12 +259,9 @@ static ssize_t w1_master_attribute_show_search(struct device *dev,
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible (&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%d\n", md->search_count);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -291,12 +271,9 @@ static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct devic
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "0x%p\n", md->bus_master);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -312,12 +289,9 @@ static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, stru
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%d\n", md->max_slave_count);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -326,12 +300,9 @@ static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct devi
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%lu\n", md->attempts);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -340,12 +311,9 @@ static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct d
struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%d\n", md->slave_count);
-
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return count;
}
@@ -354,8 +322,7 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device
struct w1_master *md = dev_to_w1_master(dev);
int c = PAGE_SIZE;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
+ mutex_lock(&md->mutex);
if (md->slave_count == 0)
c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
@@ -370,7 +337,7 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device
}
}
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return PAGE_SIZE - c;
}
@@ -620,7 +587,7 @@ static struct w1_master *w1_search_master(void *data)
struct w1_master *dev;
int found = 0;
- down(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
@@ -628,7 +595,7 @@ static struct w1_master *w1_search_master(void *data)
break;
}
}
- up(&w1_mlock);
+ mutex_unlock(&w1_mlock);
return (found)?dev:NULL;
}
@@ -638,7 +605,7 @@ struct w1_master *w1_search_master_id(u32 id)
struct w1_master *dev;
int found = 0;
- down(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->id == id) {
found = 1;
@@ -646,7 +613,7 @@ struct w1_master *w1_search_master_id(u32 id)
break;
}
}
- up(&w1_mlock);
+ mutex_unlock(&w1_mlock);
return (found)?dev:NULL;
}
@@ -657,9 +624,9 @@ struct w1_slave *w1_search_slave(struct w1_reg_num *id)
struct w1_slave *sl = NULL;
int found = 0;
- down(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
- down(&dev->mutex);
+ mutex_lock(&dev->mutex);
list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
if (sl->reg_num.family == id->family &&
sl->reg_num.id == id->id &&
@@ -670,12 +637,12 @@ struct w1_slave *w1_search_slave(struct w1_reg_num *id)
break;
}
}
- up(&dev->mutex);
+ mutex_unlock(&dev->mutex);
if (found)
break;
}
- up(&w1_mlock);
+ mutex_unlock(&w1_mlock);
return (found)?sl:NULL;
}
@@ -684,13 +651,13 @@ void w1_reconnect_slaves(struct w1_family *f)
{
struct w1_master *dev;
- down(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
dev->name, f->fid);
set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
}
- up(&w1_mlock);
+ mutex_unlock(&w1_mlock);
}
static void w1_slave_found(void *data, u64 rn)
@@ -845,23 +812,23 @@ static int w1_control(void *data)
if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
- down(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_del(&dev->w1_master_entry);
- up(&w1_mlock);
+ mutex_unlock(&w1_mlock);
- down(&dev->mutex);
+ mutex_lock(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
w1_slave_detach(sl);
}
w1_destroy_master_attributes(dev);
- up(&dev->mutex);
+ mutex_unlock(&dev->mutex);
atomic_dec(&dev->refcnt);
continue;
}
if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
- down(&dev->mutex);
+ mutex_lock(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
if (sl->family->fid == W1_FAMILY_DEFAULT) {
struct w1_reg_num rn;
@@ -874,7 +841,7 @@ static int w1_control(void *data)
}
dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
- up(&dev->mutex);
+ mutex_unlock(&dev->mutex);
}
}
}
@@ -921,12 +888,9 @@ int w1_process(void *data)
if (dev->search_count == 0)
continue;
- if (down_interruptible(&dev->mutex))
- continue;
-
+ mutex_lock(&dev->mutex);
w1_search_process(dev, W1_SEARCH);
-
- up(&dev->mutex);
+ mutex_unlock(&dev->mutex);
}
atomic_dec(&dev->refcnt);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-01 03:40:10 +0300