[PATCH] w1: reconnect feature.
I've created reconnect feature - if on start there are no registered families
all new devices will have defailt family, later when driver for appropriate
family is loaded, slaves, which were faound earlier, will still have defult
family instead of right one. Reconnect feature will force control thread to run
through all master devices and all slaves found and search for slaves with
default family id and try to reconnect them.
It does not store newly registered family and does not check only those slaves
which have reg_num.family the same as being registered one - all slaves with
default family are reconnected.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/w1/ds_w1_bridge.c b/drivers/w1/ds_w1_bridge.c
index 0baaeb5..7bddd8a 100644
--- a/drivers/w1/ds_w1_bridge.c
+++ b/drivers/w1/ds_w1_bridge.c
@@ -83,11 +83,11 @@
return byte;
}
-static void ds9490r_write_block(unsigned long data, u8 *buf, int len)
+static void ds9490r_write_block(unsigned long data, const u8 *buf, int len)
{
struct ds_device *dev = (struct ds_device *)data;
- ds_write_block(dev, buf, len);
+ ds_write_block(dev, (u8 *)buf, len);
}
static u8 ds9490r_read_block(unsigned long data, u8 *buf, int len)
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 0e6ccd4..b460927 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -469,6 +469,8 @@
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);
@@ -492,6 +494,20 @@
return (found)?dev:NULL;
}
+void w1_reconnect_slaves(struct w1_family *f)
+{
+ struct w1_master *dev;
+
+ spin_lock_bh(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ dev_info(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
+ dev->name, f->fid);
+ set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ }
+ spin_unlock_bh(&w1_mlock);
+}
+
+
static void w1_slave_found(unsigned long data, u64 rn)
{
int slave_count;
@@ -637,7 +653,7 @@
flush_signals(current);
list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
- if (!control_needs_exit && !dev->need_exit)
+ if (!control_needs_exit && !dev->flags)
continue;
/*
* Little race: we can create thread but not set the flag.
@@ -648,12 +664,8 @@
continue;
}
- spin_lock_bh(&w1_mlock);
- list_del(&dev->w1_master_entry);
- spin_unlock_bh(&w1_mlock);
-
if (control_needs_exit) {
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
err = kill_proc(dev->kpid, SIGTERM, 1);
if (err)
@@ -662,16 +674,42 @@
dev->kpid);
}
- wait_for_completion(&dev->dev_exited);
+ if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ wait_for_completion(&dev->dev_exited);
+ spin_lock_bh(&w1_mlock);
+ list_del(&dev->w1_master_entry);
+ spin_unlock_bh(&w1_mlock);
- list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
- list_del(&sl->w1_slave_entry);
+ 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_slave_detach(sl);
+ kfree(sl);
+ }
+ w1_destroy_master_attributes(dev);
+ atomic_dec(&dev->refcnt);
+ continue;
}
- w1_destroy_master_attributes(dev);
- atomic_dec(&dev->refcnt);
+
+ 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) {
+ 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_attach_slave_device(dev, &rn);
+ }
+ }
+ clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ up(&dev->mutex);
+ }
}
}
@@ -686,14 +724,14 @@
daemonize("%s", dev->name);
allow_signal(SIGTERM);
- while (!dev->need_exit) {
+ while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze(PF_FREEZE);
msleep_interruptible(w1_timeout * 1000);
if (signal_pending(current))
flush_signals(current);
- if (dev->need_exit)
+ if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
break;
if (!dev->initialized)
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 6b5f7be..4f0a986 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -151,6 +151,9 @@
void (*search)(unsigned long, w1_slave_found_callback);
};
+#define W1_MASTER_NEED_EXIT 0
+#define W1_MASTER_NEED_RECONNECT 1
+
struct w1_master
{
struct list_head w1_master_entry;
@@ -169,7 +172,8 @@
void *priv;
int priv_size;
- int need_exit;
+ long flags;
+
pid_t kpid;
struct semaphore mutex;
diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c
index b8502d9..73e73f6 100644
--- a/drivers/w1/w1_family.c
+++ b/drivers/w1/w1_family.c
@@ -60,9 +60,10 @@
newf->need_exit = 0;
list_add_tail(&newf->family_entry, &w1_families);
}
-
spin_unlock(&w1_flock);
+ w1_reconnect_slaves(newf);
+
return ret;
}
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index cf18f13..35e85d9 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -124,10 +124,9 @@
/* validate minimum functionality */
if (!(master->touch_bit && master->reset_bus) &&
- !(master->write_bit && master->read_bit))
- {
- printk(KERN_ERR "w1_add_master_device: invalid function set\n");
- return(-EINVAL);
+ !(master->write_bit && master->read_bit)) {
+ printk(KERN_ERR "w1_add_master_device: invalid function set\n");
+ return(-EINVAL);
}
dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
@@ -163,7 +162,7 @@
return 0;
err_out_kill_thread:
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
if (kill_proc(dev->kpid, SIGTERM, 1))
dev_err(&dev->dev,
"Failed to send signal to w1 kernel thread %d.\n",
@@ -181,7 +180,7 @@
int err;
struct w1_netlink_msg msg;
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
err = kill_proc(dev->kpid, SIGTERM, 1);
if (err)
dev_err(&dev->dev,