This patch removes old-style kernel thread initialization
and changes w1 to use kthread api.
It is based on Christoph Hellwig <[email protected]> work.
Signed-off-by: Evgeniy Polyakov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/w1/w1.c | 56 +++++++++++++++------------------------------------
drivers/w1/w1.h | 3 +--
drivers/w1/w1_int.c | 34 ++++++++++---------------------
3 files changed, 28 insertions(+), 65 deletions(-)
674a396c6d2ba0341ebdd7c1c9950f32f018e2dd
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index d640c1e..a698b51 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -30,6 +30,7 @@
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/sched.h>
+#include <linux/kthread.h>
#include <asm/atomic.h>
@@ -57,9 +58,7 @@ module_param_named(slave_ttl, w1_max_sla
DEFINE_SPINLOCK(w1_mlock);
LIST_HEAD(w1_masters);
-static pid_t control_thread;
-static int control_needs_exit;
-static DECLARE_COMPLETION(w1_control_complete);
+static struct task_struct *w1_control_thread;
static int w1_master_match(struct device *dev, struct device_driver *drv)
{
@@ -717,22 +716,16 @@ static int w1_control(void *data)
{
struct w1_slave *sl, *sln;
struct w1_master *dev, *n;
- int err, have_to_wait = 0;
+ int have_to_wait = 0;
- daemonize("w1_control");
- allow_signal(SIGTERM);
-
- while (!control_needs_exit || have_to_wait) {
+ while (!kthread_should_stop() || 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 (!control_needs_exit && !dev->flags)
+ if (!kthread_should_stop() && !dev->flags)
continue;
/*
* Little race: we can create thread but not set the flag.
@@ -743,21 +736,12 @@ static int w1_control(void *data)
continue;
}
- if (control_needs_exit) {
+ if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
- 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);
+ spin_lock(&w1_mlock);
list_del(&dev->w1_master_entry);
- spin_unlock_bh(&w1_mlock);
+ spin_unlock(&w1_mlock);
down(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
@@ -789,7 +773,7 @@ static int w1_control(void *data)
}
}
- complete_and_exit(&w1_control_complete, 0);
+ return 0;
}
int w1_process(void *data)
@@ -797,17 +781,11 @@ int w1_process(void *data)
struct w1_master *dev = (struct w1_master *) data;
struct w1_slave *sl, *sln;
- daemonize("%s", dev->name);
- allow_signal(SIGTERM);
-
- while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze();
msleep_interruptible(w1_timeout * 1000);
- if (signal_pending(current))
- flush_signals(current);
-
- if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
+ if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
break;
if (!dev->initialized)
@@ -840,7 +818,6 @@ int w1_process(void *data)
}
atomic_dec(&dev->refcnt);
- complete_and_exit(&dev->dev_exited, 0);
return 0;
}
@@ -873,11 +850,11 @@ static int w1_init(void)
goto err_out_master_unregister;
}
- control_thread = kernel_thread(&w1_control, NULL, 0);
- if (control_thread < 0) {
+ w1_control_thread = kthread_run(w1_control, NULL, "w1_control");
+ if (IS_ERR(w1_control_thread)) {
+ retval = PTR_ERR(w1_control_thread);
printk(KERN_ERR "Failed to create control thread. err=%d\n",
- control_thread);
- retval = control_thread;
+ retval);
goto err_out_slave_unregister;
}
@@ -903,8 +880,7 @@ static void w1_fini(void)
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);
+ kthread_stop(w1_control_thread);
driver_unregister(&w1_slave_driver);
driver_unregister(&w1_master_driver);
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 5f09213..5698050 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -172,12 +172,11 @@ struct w1_master
long flags;
- pid_t kpid;
+ struct task_struct *thread;
struct semaphore mutex;
struct device_driver *driver;
struct device dev;
- struct completion dev_exited;
struct w1_bus_master *bus_master;
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index a2f9065..68565aa 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -22,6 +22,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/delay.h>
+#include <linux/kthread.h>
#include "w1.h"
#include "w1_log.h"
@@ -56,7 +57,6 @@ static struct w1_master * w1_alloc_dev(u
dev->max_slave_count = slave_count;
dev->slave_count = 0;
dev->attempts = 0;
- dev->kpid = -1;
dev->initialized = 0;
dev->id = id;
dev->slave_ttl = slave_ttl;
@@ -67,8 +67,6 @@ static struct w1_master * w1_alloc_dev(u
INIT_LIST_HEAD(&dev->slist);
init_MUTEX(&dev->mutex);
- init_completion(&dev->dev_exited);
-
memcpy(&dev->dev, device, sizeof(struct device));
snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
"w1_bus_master%u", dev->id);
@@ -116,12 +114,12 @@ int w1_add_master_device(struct w1_bus_m
if (!dev)
return -ENOMEM;
- dev->kpid = kernel_thread(&w1_process, dev, 0);
- if (dev->kpid < 0) {
+ dev->thread = kthread_run(&w1_process, dev, "%s", dev->name);
+ if (IS_ERR(dev->thread)) {
+ retval = PTR_ERR(dev->thread);
dev_err(&dev->dev,
"Failed to create new kernel thread. err=%d\n",
- dev->kpid);
- retval = dev->kpid;
+ retval);
goto err_out_free_dev;
}
@@ -138,20 +136,14 @@ int w1_add_master_device(struct w1_bus_m
spin_unlock(&w1_mlock);
msg.id.mst.id = dev->id;
- msg.id.mst.pid = dev->kpid;
+ msg.id.mst.pid = dev->thread->pid;
msg.type = W1_MASTER_ADD;
w1_netlink_send(dev, &msg);
return 0;
err_out_kill_thread:
- 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",
- dev->kpid);
- wait_for_completion(&dev->dev_exited);
-
+ kthread_stop(dev->thread);
err_out_free_dev:
w1_free_dev(dev);
@@ -160,18 +152,14 @@ err_out_free_dev:
void __w1_remove_master_device(struct w1_master *dev)
{
- int err;
struct w1_netlink_msg msg;
+ pid_t pid = dev->thread->pid;
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
- err = kill_proc(dev->kpid, SIGTERM, 1);
- if (err)
- dev_err(&dev->dev,
- "%s: Failed to send signal to w1 kernel thread %d.\n",
- __func__, dev->kpid);
+ kthread_stop(dev->thread);
while (atomic_read(&dev->refcnt)) {
- dev_dbg(&dev->dev, "Waiting for %s to become free: refcnt=%d.\n",
+ dev_info(&dev->dev, "Waiting for %s to become free: refcnt=%d.\n",
dev->name, atomic_read(&dev->refcnt));
if (msleep_interruptible(1000))
@@ -179,7 +167,7 @@ void __w1_remove_master_device(struct w1
}
msg.id.mst.id = dev->id;
- msg.id.mst.pid = dev->kpid;
+ msg.id.mst.pid = pid;
msg.type = W1_MASTER_REMOVE;
w1_netlink_send(dev, &msg);
--
1.2.4
-
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