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[Bluetooth] Convert RFCOMM to use kthread API 

This patch does the full kthread conversion for the RFCOMM protocol. It
makes the code slightly simpler and more maintainable.

Based on a patch from Christoph Hellwig <hch@lst.de>

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2007-10-20 21:37:20 +02:00 committed by David S. Miller
parent 2cb3377a29
commit a524eccc73
1 changed files with 22 additions and 40 deletions
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62
net/bluetooth/rfcomm/core.c
View File

@ -33,11 +33,11 @@
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/freezer.h>
#include <linux/wait.h>
#include <linux/device.h>
#include <linux/net.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <net/sock.h>
#include <asm/uaccess.h>
@ -68,7 +68,6 @@ static DEFINE_MUTEX(rfcomm_mutex);
static unsigned long rfcomm_event;
static LIST_HEAD(session_list);
static atomic_t terminate, running;
static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
@ -1850,26 +1849,6 @@ static inline void rfcomm_process_sessions(void)
rfcomm_unlock();
}
static void rfcomm_worker(void)
{
BT_DBG("");
while (!atomic_read(&terminate)) {
set_current_state(TASK_INTERRUPTIBLE);
if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
/* No pending events. Let's sleep.
* Incoming connections and data will wake us up. */
schedule();
}
set_current_state(TASK_RUNNING);
/* Process stuff */
clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
rfcomm_process_sessions();
}
return;
}
static int rfcomm_add_listener(bdaddr_t *ba)
{
struct sockaddr_l2 addr;
@ -1935,22 +1914,28 @@ static void rfcomm_kill_listener(void)
static int rfcomm_run(void *unused)
{
rfcomm_thread = current;
atomic_inc(&running);
daemonize("krfcommd");
set_user_nice(current, -10);
BT_DBG("");
set_user_nice(current, -10);
rfcomm_add_listener(BDADDR_ANY);
rfcomm_worker();
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
/* No pending events. Let's sleep.
* Incoming connections and data will wake us up. */
schedule();
}
set_current_state(TASK_RUNNING);
/* Process stuff */
clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
rfcomm_process_sessions();
}
rfcomm_kill_listener();
atomic_dec(&running);
return 0;
}
@ -2059,7 +2044,11 @@ static int __init rfcomm_init(void)
hci_register_cb(&rfcomm_cb);
kernel_thread(rfcomm_run, NULL, CLONE_KERNEL);
rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
if (IS_ERR(rfcomm_thread)) {
hci_unregister_cb(&rfcomm_cb);
return PTR_ERR(rfcomm_thread);
}
if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
BT_ERR("Failed to create RFCOMM info file");
@ -2081,14 +2070,7 @@ static void __exit rfcomm_exit(void)
hci_unregister_cb(&rfcomm_cb);
/* Terminate working thread.
* ie. Set terminate flag and wake it up */
atomic_inc(&terminate);
rfcomm_schedule(RFCOMM_SCHED_STATE);
/* Wait until thread is running */
while (atomic_read(&running))
schedule();
kthread_stop(rfcomm_thread);
#ifdef CONFIG_BT_RFCOMM_TTY
rfcomm_cleanup_ttys();