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Commit 3aca692d authored by Evgeniy Polyakov's avatar Evgeniy Polyakov Committed by Greg Kroah-Hartman
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[PATCH] w1: Detouching bug fixed. 

Signed-off-by: default avatarEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d2a4ef6a
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Showing with 51 additions and 51 deletions
drivers/w1/w1.c
View file @ 3aca692d
......@@ -45,10 +45,12 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
static int w1_timeout = 10;
static int w1_control_timeout = 1;
int w1_max_slave_count = 10;
int w1_max_slave_ttl = 10;
module_param_named(timeout, w1_timeout, int, 0);
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);
......@@ -69,21 +71,35 @@ static int w1_master_probe(struct device *dev)
return -ENODEV;
}
static int w1_master_remove(struct device *dev)
{
return 0;
}
static void w1_master_release(struct device *dev)
{
struct w1_master *md = dev_to_w1_master(dev);
complete(&md->dev_released);
dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
if (md->nls && md->nls->sk_socket)
sock_release(md->nls->sk_socket);
memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
kfree(md);
}
static void w1_slave_release(struct device *dev)
{
struct w1_slave *sl = dev_to_w1_slave(dev);
complete(&sl->dev_released);
dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
while (atomic_read(&sl->refcnt)) {
dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
sl->name, atomic_read(&sl->refcnt));
if (msleep_interruptible(1000))
flush_signals(current);
}
w1_family_put(sl->family);
sl->master->slave_count--;
complete(&sl->released);
}
static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
......@@ -109,7 +125,7 @@ static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, siz
atomic_dec(&sl->refcnt);
return count;
}
}
static struct device_attribute w1_slave_attr_name =
__ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
......@@ -139,7 +155,6 @@ struct device_driver w1_master_driver = {
.name = "w1_master_driver",
.bus = &w1_bus_type,
.probe = w1_master_probe,
.remove = w1_master_remove,
};
struct device w1_master_device = {
......@@ -160,6 +175,7 @@ struct device w1_slave_device = {
.bus = &w1_bus_type,
.bus_id = "w1 bus slave",
.driver = &w1_slave_driver,
.release = &w1_slave_release
};
static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
......@@ -406,8 +422,7 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
(unsigned int) sl->reg_num.family,
(unsigned long long) sl->reg_num.id);
dev_dbg(&sl->dev, "%s: registering %s.\n", __func__,
&sl->dev.bus_id[0]);
dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]);
err = device_register(&sl->dev);
if (err < 0) {
......@@ -480,7 +495,7 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
atomic_set(&sl->refcnt, 0);
init_completion(&sl->dev_released);
init_completion(&sl->released);
spin_lock(&w1_flock);
f = w1_family_registered(rn->family);
......@@ -512,6 +527,8 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
msg.type = W1_SLAVE_ADD;
w1_netlink_send(dev, &msg);
dev_info(&dev->dev, "Finished %s for sl=%p.\n", __func__, sl);
return 0;
}
......@@ -519,29 +536,23 @@ 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);
dev_info(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
while (atomic_read(&sl->refcnt)) {
printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
sl->name, atomic_read(&sl->refcnt));
if (msleep_interruptible(1000))
flush_signals(current);
}
list_del(&sl->w1_slave_entry);
if (sl->family->fops && sl->family->fops->remove_slave)
sl->family->fops->remove_slave(sl);
memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
msg.type = W1_SLAVE_REMOVE;
w1_netlink_send(sl->master, &msg);
sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
device_remove_file(&sl->dev, &w1_slave_attr_name);
device_unregister(&sl->dev);
w1_family_put(sl->family);
sl->master->slave_count--;
memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
msg.type = W1_SLAVE_REMOVE;
w1_netlink_send(sl->master, &msg);
wait_for_completion(&sl->released);
kfree(sl);
}
static struct w1_master *w1_search_master(unsigned long data)
......@@ -713,7 +724,7 @@ static int w1_control(void *data)
have_to_wait = 0;
try_to_freeze();
msleep_interruptible(w1_timeout * 1000);
msleep_interruptible(w1_control_timeout * 1000);
if (signal_pending(current))
flush_signals(current);
......@@ -746,13 +757,12 @@ static int w1_control(void *data)
list_del(&dev->w1_master_entry);
spin_unlock_bh(&w1_mlock);
down(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
list_del(&sl->w1_slave_entry);
w1_slave_detach(sl);
kfree(sl);
}
w1_destroy_master_attributes(dev);
up(&dev->mutex);
atomic_dec(&dev->refcnt);
continue;
}
......@@ -760,19 +770,17 @@ static int w1_control(void *data)
if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
dev_info(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
down(&dev->mutex);
list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
if (sl->family->fid == W1_FAMILY_DEFAULT) {
struct w1_reg_num rn;
list_del(&sl->w1_slave_entry);
w1_slave_detach(sl);
memcpy(&rn, &sl->reg_num, sizeof(rn));
kfree(sl);
w1_slave_detach(sl);
w1_attach_slave_device(dev, &rn);
}
}
dev_info(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
up(&dev->mutex);
}
......@@ -816,10 +824,7 @@ int w1_process(void *data)
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))
......
drivers/w1/w1.h
View file @ 3aca692d
......@@ -76,7 +76,7 @@ struct w1_slave
struct w1_master *master;
struct w1_family *family;
struct device dev;
struct completion dev_released;
struct completion released;
};
typedef void (* w1_slave_found_callback)(unsigned long, u64);
......@@ -176,7 +176,6 @@ struct w1_master
struct device_driver *driver;
struct device dev;
struct completion dev_released;
struct completion dev_exited;
struct w1_bus_master *bus_master;
......
drivers/w1/w1_int.c
View file @ 3aca692d
......@@ -76,7 +76,6 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
INIT_LIST_HEAD(&dev->slist);
init_MUTEX(&dev->mutex);
init_completion(&dev->dev_released);
init_completion(&dev->dev_exited);
memcpy(&dev->dev, device, sizeof(struct device));
......@@ -107,9 +106,6 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
void w1_free_dev(struct w1_master *dev)
{
device_unregister(&dev->dev);
dev_fini_netlink(dev);
memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
kfree(dev);
}
int w1_add_master_device(struct w1_bus_master *master)
......@@ -184,7 +180,7 @@ void __w1_remove_master_device(struct w1_master *dev)
__func__, dev->kpid);
while (atomic_read(&dev->refcnt)) {
printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
dev_dbg(&dev->dev, "Waiting for %s to become free: refcnt=%d.\n",
dev->name, atomic_read(&dev->refcnt));
if (msleep_interruptible(1000))
......
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