linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / drivers / w1 / w1.c

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 6dcffc7..024206c 100644 (file)
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -30,7 +30,6 @@
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
-#include <linux/kthread.h>
 
 #include <asm/atomic.h>
 
@@ -58,7 +57,9 @@ module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
 DEFINE_SPINLOCK(w1_mlock);
 LIST_HEAD(w1_masters);
 
-static struct task_struct *w1_control_thread;
+static pid_t control_thread;
+static int control_needs_exit;
+static DECLARE_COMPLETION(w1_control_complete);
 
 static int w1_master_match(struct device *dev, struct device_driver *drv)
 {
@@ -163,12 +164,11 @@ struct device w1_master_device = {
        .release = &w1_master_release
 };
 
-static struct device_driver w1_slave_driver = {
+struct device_driver w1_slave_driver = {
        .name = "w1_slave_driver",
        .bus = &w1_bus_type,
 };
 
-#if 0
 struct device w1_slave_device = {
        .parent = NULL,
        .bus = &w1_bus_type,
@@ -176,7 +176,6 @@ struct device w1_slave_device = {
        .driver = &w1_slave_driver,
        .release = &w1_slave_release
 };
-#endif  /*  0  */
 
 static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -356,7 +355,7 @@ int w1_create_master_attributes(struct w1_master *master)
        return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
 }
 
-static void w1_destroy_master_attributes(struct w1_master *master)
+void w1_destroy_master_attributes(struct w1_master *master)
 {
        sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
 }
@@ -387,14 +386,11 @@ static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer
        if (dev->driver != &w1_slave_driver || !sl)
                return 0;
 
-       err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
-                       &cur_len, "W1_FID=%02X", sl->reg_num.family);
+       err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
        if (err)
                return err;
 
-       err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
-                       &cur_len, "W1_SLAVE_ID=%024LX",
-                       (unsigned long long)sl->reg_num.id);
+       err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
        if (err)
                return err;
 
@@ -556,7 +552,7 @@ static void w1_slave_detach(struct w1_slave *sl)
        kfree(sl);
 }
 
-static struct w1_master *w1_search_master(void *data)
+static struct w1_master *w1_search_master(unsigned long data)
 {
        struct w1_master *dev;
        int found = 0;
@@ -587,7 +583,7 @@ void w1_reconnect_slaves(struct w1_family *f)
        spin_unlock_bh(&w1_mlock);
 }
 
-static void w1_slave_found(void *data, u64 rn)
+static void w1_slave_found(unsigned long data, u64 rn)
 {
        int slave_count;
        struct w1_slave *sl;
@@ -599,8 +595,8 @@ static void w1_slave_found(void *data, u64 rn)
 
        dev = w1_search_master(data);
        if (!dev) {
-               printk(KERN_ERR "Failed to find w1 master device for data %p, "
-                      "it is impossible.\n", data);
+               printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n",
+                               data);
                return;
        }
 
@@ -672,7 +668,7 @@ void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
                 * Return 0 - device(s) present, 1 - no devices present.
                 */
                if (w1_reset_bus(dev)) {
-                       //dev_dbg(&dev->dev, "No devices present on the wire.\n");
+                       dev_dbg(&dev->dev, "No devices present on the wire.\n");
                        break;
                }
 
@@ -716,16 +712,22 @@ static int w1_control(void *data)
 {
        struct w1_slave *sl, *sln;
        struct w1_master *dev, *n;
-       int have_to_wait = 0;
+       int err, have_to_wait = 0;
 
-       while (!kthread_should_stop() || have_to_wait) {
+       daemonize("w1_control");
+       allow_signal(SIGTERM);
+
+       while (!control_needs_exit || have_to_wait) {
                have_to_wait = 0;
 
                try_to_freeze();
                msleep_interruptible(w1_control_timeout * 1000);
 
+               if (signal_pending(current))
+                       flush_signals(current);
+
                list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
-                       if (!kthread_should_stop() && !dev->flags)
+                       if (!control_needs_exit && !dev->flags)
                                continue;
                        /*
                         * Little race: we can create thread but not set the flag.
@@ -736,12 +738,21 @@ static int w1_control(void *data)
                                continue;
                        }
 
-                       if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+                       if (control_needs_exit) {
                                set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
 
-                               spin_lock(&w1_mlock);
+                               err = kill_proc(dev->kpid, SIGTERM, 1);
+                               if (err)
+                                       dev_err(&dev->dev,
+                                                "Failed to send signal to w1 kernel thread %d.\n",
+                                                dev->kpid);
+                       }
+
+                       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(&w1_mlock);
+                               spin_unlock_bh(&w1_mlock);
 
                                down(&dev->mutex);
                                list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
@@ -773,7 +784,7 @@ static int w1_control(void *data)
                }
        }
 
-       return 0;
+       complete_and_exit(&w1_control_complete, 0);
 }
 
 int w1_process(void *data)
@@ -781,11 +792,17 @@ int w1_process(void *data)
        struct w1_master *dev = (struct w1_master *) data;
        struct w1_slave *sl, *sln;
 
-       while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+       daemonize("%s", dev->name);
+       allow_signal(SIGTERM);
+
+       while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
                try_to_freeze();
                msleep_interruptible(w1_timeout * 1000);
 
-               if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
+               if (signal_pending(current))
+                       flush_signals(current);
+
+               if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
                        break;
 
                if (!dev->initialized)
@@ -818,6 +835,7 @@ int w1_process(void *data)
        }
 
        atomic_dec(&dev->refcnt);
+       complete_and_exit(&dev->dev_exited, 0);
 
        return 0;
 }
@@ -850,11 +868,11 @@ static int w1_init(void)
                goto err_out_master_unregister;
        }
 
-       w1_control_thread = kthread_run(w1_control, NULL, "w1_control");
-       if (IS_ERR(w1_control_thread)) {
-               retval = PTR_ERR(w1_control_thread);
+       control_thread = kernel_thread(&w1_control, NULL, 0);
+       if (control_thread < 0) {
                printk(KERN_ERR "Failed to create control thread. err=%d\n",
-                       retval);
+                       control_thread);
+               retval = control_thread;
                goto err_out_slave_unregister;
        }
 
@@ -880,7 +898,8 @@ static void w1_fini(void)
        list_for_each_entry(dev, &w1_masters, w1_master_entry)
                __w1_remove_master_device(dev);
 
-       kthread_stop(w1_control_thread);
+       control_needs_exit = 1;
+       wait_for_completion(&w1_control_complete);
 
        driver_unregister(&w1_slave_driver);
        driver_unregister(&w1_master_driver);