if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
- tty_lock(tty);
+ tty_lock();
tmp.line = tty->index;
tmp.port = state->port;
tmp.flags = state->tport.flags;
tmp.close_delay = state->tport.close_delay;
tmp.closing_wait = state->tport.closing_wait;
tmp.custom_divisor = state->custom_divisor;
- tty_unlock(tty);
+ tty_unlock();
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
- tty_lock(tty);
+ tty_lock();
change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
new_serial.custom_divisor != state->custom_divisor;
if (new_serial.irq || new_serial.port != state->port ||
new_serial.xmit_fifo_size != state->xmit_fifo_size) {
- tty_unlock(tty);
+ tty_unlock();
return -EINVAL;
}
(new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
((new_serial.flags & ~ASYNC_USR_MASK) !=
(port->flags & ~ASYNC_USR_MASK))) {
- tty_unlock(tty);
+ tty_unlock();
return -EPERM;
}
port->flags = ((port->flags & ~ASYNC_USR_MASK) |
}
if (new_serial.baud_base < 9600) {
- tty_unlock(tty);
+ tty_unlock();
return -EINVAL;
}
}
} else
retval = startup(tty, state);
- tty_unlock(tty);
+ tty_unlock();
return retval;
}
* If the port is the middle of closing, bail out now
*/
if (tty_hung_up_p(filp) || (info->port.flags & ASYNC_CLOSING)) {
- wait_event_interruptible_tty(tty, info->port.close_wait,
+ wait_event_interruptible_tty(info->port.close_wait,
!(info->port.flags & ASYNC_CLOSING));
return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;
}
TRACE_L("read()");
- tty_lock(tty);
+ tty_lock();
pClient = findClient(pInfo, task_pid(current));
if (pClient) {
goto unlock;
}
/* block until there is a message: */
- wait_event_interruptible_tty(tty, pInfo->read_wait,
+ wait_event_interruptible_tty(pInfo->read_wait,
(pMsg = remove_msg(pInfo, pClient)));
}
}
ret = -EPERM;
unlock:
- tty_unlock(tty);
+ tty_unlock();
return ret;
}
pHeader->locks = 0;
pHeader->owner = NULL;
- tty_lock(tty);
+ tty_lock();
pClient = findClient(pInfo, task_pid(current));
if (pClient) {
add_tx_queue(pInfo, pHeader);
trigger_transmit(pInfo);
- tty_unlock(tty);
+ tty_unlock();
return 0;
}
wake_up_interruptible(&tty->read_wait);
wake_up_interruptible(&tty->write_wait);
tty->packet = 0;
- /* Review - krefs on tty_link ?? */
if (!tty->link)
return;
tty->link->packet = 0;
mutex_unlock(&devpts_mutex);
}
#endif
- tty_unlock(tty);
+ tty_unlock();
tty_vhangup(tty->link);
- tty_lock(tty);
+ tty_lock();
}
}
return retval;
/* find a device that is not in use. */
- mutex_lock(&devpts_mutex);
+ tty_lock();
index = devpts_new_index(inode);
- mutex_unlock(&devpts_mutex);
+ tty_unlock();
if (index < 0) {
retval = index;
goto err_file;
}
mutex_lock(&tty_mutex);
+ mutex_lock(&devpts_mutex);
tty = tty_init_dev(ptm_driver, index);
+ mutex_unlock(&devpts_mutex);
+ tty_lock();
+ mutex_unlock(&tty_mutex);
if (IS_ERR(tty)) {
retval = PTR_ERR(tty);
goto out;
}
- /* The tty returned here is locked so we can safely
- drop the mutex */
- mutex_unlock(&tty_mutex);
-
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
tty_add_file(tty, filp);
if (retval)
goto err_release;
- tty_unlock(tty);
+ tty_unlock();
return 0;
err_release:
- tty_unlock(tty);
+ tty_unlock();
tty_release(inode, filp);
return retval;
out:
- mutex_unlock(&tty_mutex);
devpts_kill_index(inode, index);
+ tty_unlock();
err_file:
tty_free_file(filp);
return retval;
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
- wait_event_interruptible_tty(tty, info->close_wait,
+ wait_event_interruptible_tty(info->close_wait,
!(info->flags & ASYNC_CLOSING));
#ifdef SERIAL_DO_RESTART
if (info->flags & ASYNC_HUP_NOTIFY)
printk("block_til_ready blocking: ttyS%d, count = %d\n",
info->line, info->count);
#endif
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
- wait_event_interruptible_tty(tty, info->close_wait,
+ wait_event_interruptible_tty(info->close_wait,
!(info->flags & ASYNC_CLOSING));
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
set_current_state(TASK_RUNNING);
}
DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
set_current_state(TASK_RUNNING);
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
set_current_state(TASK_RUNNING);
put_device(tty->dev);
kfree(tty->write_buf);
tty_buffer_free_all(tty);
- tty->magic = 0xDEADDEAD;
kfree(tty);
}
}
spin_unlock(&redirect_lock);
- tty_lock(tty);
+ tty_lock();
/* some functions below drop BTM, so we need this bit */
set_bit(TTY_HUPPING, &tty->flags);
clear_bit(TTY_HUPPING, &tty->flags);
tty_ldisc_enable(tty);
- tty_unlock(tty);
+ tty_unlock();
if (f)
fput(f);
{
if (tty) {
mutex_lock(&tty->atomic_write_lock);
- tty_lock(tty);
+ tty_lock();
if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) {
- tty_unlock(tty);
+ tty_unlock();
tty->ops->write(tty, msg, strlen(msg));
} else
- tty_unlock(tty);
+ tty_unlock();
tty_write_unlock(tty);
}
return;
}
initialize_tty_struct(tty, driver, idx);
- tty_lock(tty);
retval = tty_driver_install_tty(driver, tty);
if (retval < 0)
goto err_deinit_tty;
retval = tty_ldisc_setup(tty, tty->link);
if (retval)
goto err_release_tty;
- /* Return the tty locked so that it cannot vanish under the caller */
return tty;
err_deinit_tty:
- tty_unlock(tty);
deinitialize_tty_struct(tty);
free_tty_struct(tty);
err_module_put:
/* call the tty release_tty routine to clean out this slot */
err_release_tty:
- tty_unlock(tty);
printk_ratelimited(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
release_tty(tty, idx);
if (tty_paranoia_check(tty, inode, __func__))
return 0;
- tty_lock(tty);
+ tty_lock();
check_tty_count(tty, __func__);
__tty_fasync(-1, filp, 0);
pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
tty->driver->subtype == PTY_TYPE_MASTER);
devpts = (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) != 0;
- /* Review: parallel close */
o_tty = tty->link;
if (tty_release_checks(tty, o_tty, idx)) {
- tty_unlock(tty);
+ tty_unlock();
return 0;
}
if (tty->ops->close)
tty->ops->close(tty, filp);
- tty_unlock(tty);
+ tty_unlock();
/*
* Sanity check: if tty->count is going to zero, there shouldn't be
* any waiters on tty->read_wait or tty->write_wait. We test the
opens on /dev/tty */
mutex_lock(&tty_mutex);
- tty_lock_pair(tty, o_tty);
+ tty_lock();
tty_closing = tty->count <= 1;
o_tty_closing = o_tty &&
(o_tty->count <= (pty_master ? 1 : 0));
printk(KERN_WARNING "%s: %s: read/write wait queue active!\n",
__func__, tty_name(tty, buf));
- tty_unlock_pair(tty, o_tty);
+ tty_unlock();
mutex_unlock(&tty_mutex);
schedule();
}
/* check whether both sides are closing ... */
if (!tty_closing || (o_tty && !o_tty_closing)) {
- tty_unlock_pair(tty, o_tty);
+ tty_unlock();
return 0;
}
tty_ldisc_release(tty, o_tty);
/*
* The release_tty function takes care of the details of clearing
- * the slots and preserving the termios structure. The tty_unlock_pair
- * should be safe as we keep a kref while the tty is locked (so the
- * unlock never unlocks a freed tty).
+ * the slots and preserving the termios structure.
*/
release_tty(tty, idx);
- tty_unlock_pair(tty, o_tty);
/* Make this pty number available for reallocation */
if (devpts)
devpts_kill_index(inode, idx);
+ tty_unlock();
return 0;
}
* Locking: tty_mutex protects tty, tty_lookup_driver and tty_init_dev.
* tty->count should protect the rest.
* ->siglock protects ->signal/->sighand
- *
- * Note: the tty_unlock/lock cases without a ref are only safe due to
- * tty_mutex
*/
static int tty_open(struct inode *inode, struct file *filp)
retval = 0;
mutex_lock(&tty_mutex);
- /* This is protected by the tty_mutex */
+ tty_lock();
+
tty = tty_open_current_tty(device, filp);
if (IS_ERR(tty)) {
retval = PTR_ERR(tty);
}
if (tty) {
- tty_lock(tty);
retval = tty_reopen(tty);
- if (retval < 0) {
- tty_unlock(tty);
+ if (retval)
tty = ERR_PTR(retval);
- }
- } else /* Returns with the tty_lock held for now */
+ } else
tty = tty_init_dev(driver, index);
mutex_unlock(&tty_mutex);
if (driver)
tty_driver_kref_put(driver);
if (IS_ERR(tty)) {
+ tty_unlock();
retval = PTR_ERR(tty);
goto err_file;
}
printk(KERN_DEBUG "%s: error %d in opening %s...\n", __func__,
retval, tty->name);
#endif
- tty_unlock(tty); /* need to call tty_release without BTM */
+ tty_unlock(); /* need to call tty_release without BTM */
tty_release(inode, filp);
if (retval != -ERESTARTSYS)
return retval;
/*
* Need to reset f_op in case a hangup happened.
*/
+ tty_lock();
if (filp->f_op == &hung_up_tty_fops)
filp->f_op = &tty_fops;
+ tty_unlock();
goto retry_open;
}
- tty_unlock(tty);
+ tty_unlock();
mutex_lock(&tty_mutex);
- tty_lock(tty);
+ tty_lock();
spin_lock_irq(¤t->sighand->siglock);
if (!noctty &&
current->signal->leader &&
tty->session == NULL)
__proc_set_tty(current, tty);
spin_unlock_irq(¤t->sighand->siglock);
- tty_unlock(tty);
+ tty_unlock();
mutex_unlock(&tty_mutex);
return 0;
err_unlock:
+ tty_unlock();
mutex_unlock(&tty_mutex);
/* after locks to avoid deadlock */
if (!IS_ERR_OR_NULL(driver))
static int tty_fasync(int fd, struct file *filp, int on)
{
- struct tty_struct *tty = file_tty(filp);
int retval;
-
- tty_lock(tty);
+ tty_lock();
retval = __tty_fasync(fd, filp, on);
- tty_unlock(tty);
-
+ tty_unlock();
return retval;
}
tty->pgrp = NULL;
tty->overrun_time = jiffies;
tty_buffer_init(tty);
- mutex_init(&tty->legacy_mutex);
mutex_init(&tty->termios_mutex);
mutex_init(&tty->ldisc_mutex);
init_waitqueue_head(&tty->write_wait);
if (IS_ERR(new_ldisc))
return PTR_ERR(new_ldisc);
- tty_lock(tty);
+ tty_lock();
/*
* We need to look at the tty locking here for pty/tty pairs
* when both sides try to change in parallel.
*/
if (tty->ldisc->ops->num == ldisc) {
- tty_unlock(tty);
+ tty_unlock();
tty_ldisc_put(new_ldisc);
return 0;
}
- tty_unlock(tty);
+ tty_unlock();
/*
* Problem: What do we do if this blocks ?
* We could deadlock here
tty_wait_until_sent(tty, 0);
- tty_lock(tty);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
/*
while (test_bit(TTY_LDISC_CHANGING, &tty->flags)) {
mutex_unlock(&tty->ldisc_mutex);
- tty_unlock(tty);
+ tty_unlock();
wait_event(tty_ldisc_wait,
test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
- tty_lock(tty);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
}
o_ldisc = tty->ldisc;
- tty_unlock(tty);
+ tty_unlock();
/*
* Make sure we don't change while someone holds a
* reference to the line discipline. The TTY_LDISC bit
retval = tty_ldisc_wait_idle(tty, 5 * HZ);
- tty_lock(tty);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
/* handle wait idle failure locked */
clear_bit(TTY_LDISC_CHANGING, &tty->flags);
mutex_unlock(&tty->ldisc_mutex);
tty_ldisc_put(new_ldisc);
- tty_unlock(tty);
+ tty_unlock();
return -EIO;
}
if (o_work)
schedule_work(&o_tty->buf.work);
mutex_unlock(&tty->ldisc_mutex);
- tty_unlock(tty);
+ tty_unlock();
return retval;
}
* need to wait for another function taking the BTM
*/
clear_bit(TTY_LDISC, &tty->flags);
- tty_unlock(tty);
+ tty_unlock();
cancel_work_sync(&tty->buf.work);
mutex_unlock(&tty->ldisc_mutex);
retry:
- tty_lock(tty);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
/* At this point we have a closed ldisc and we want to
if (atomic_read(&tty->ldisc->users) != 1) {
char cur_n[TASK_COMM_LEN], tty_n[64];
long timeout = 3 * HZ;
- tty_unlock(tty);
+ tty_unlock();
while (tty_ldisc_wait_idle(tty, timeout) == -EBUSY) {
timeout = MAX_SCHEDULE_TIMEOUT;
tty_ldisc_enable(tty);
return 0;
}
-
-static void tty_ldisc_kill(struct tty_struct *tty)
-{
- mutex_lock(&tty->ldisc_mutex);
- /*
- * Now kill off the ldisc
- */
- tty_ldisc_close(tty, tty->ldisc);
- tty_ldisc_put(tty->ldisc);
- /* Force an oops if we mess this up */
- tty->ldisc = NULL;
-
- /* Ensure the next open requests the N_TTY ldisc */
- tty_set_termios_ldisc(tty, N_TTY);
- mutex_unlock(&tty->ldisc_mutex);
-}
-
/**
* tty_ldisc_release - release line discipline
* @tty: tty being shut down
* race with the set_ldisc code path.
*/
- tty_unlock_pair(tty, o_tty);
+ tty_unlock();
tty_ldisc_halt(tty);
tty_ldisc_flush_works(tty);
- if (o_tty) {
- tty_ldisc_halt(o_tty);
- tty_ldisc_flush_works(o_tty);
- }
- tty_lock_pair(tty, o_tty);
+ tty_lock();
+ mutex_lock(&tty->ldisc_mutex);
+ /*
+ * Now kill off the ldisc
+ */
+ tty_ldisc_close(tty, tty->ldisc);
+ tty_ldisc_put(tty->ldisc);
+ /* Force an oops if we mess this up */
+ tty->ldisc = NULL;
+
+ /* Ensure the next open requests the N_TTY ldisc */
+ tty_set_termios_ldisc(tty, N_TTY);
+ mutex_unlock(&tty->ldisc_mutex);
- tty_ldisc_kill(tty);
+ /* This will need doing differently if we need to lock */
if (o_tty)
- tty_ldisc_kill(o_tty);
+ tty_ldisc_release(o_tty, NULL);
/* And the memory resources remaining (buffers, termios) will be
disposed of when the kref hits zero */
#include <linux/semaphore.h>
#include <linux/sched.h>
-/* Legacy tty mutex glue */
-
-enum {
- TTY_MUTEX_NORMAL,
- TTY_MUTEX_NESTED,
-};
+/*
+ * The 'big tty mutex'
+ *
+ * This mutex is taken and released by tty_lock() and tty_unlock(),
+ * replacing the older big kernel lock.
+ * It can no longer be taken recursively, and does not get
+ * released implicitly while sleeping.
+ *
+ * Don't use in new code.
+ */
+static DEFINE_MUTEX(big_tty_mutex);
/*
* Getting the big tty mutex.
*/
-
-static void __lockfunc tty_lock_nested(struct tty_struct *tty,
- unsigned int subclass)
+void __lockfunc tty_lock(void)
{
- if (tty->magic != TTY_MAGIC) {
- printk(KERN_ERR "L Bad %p\n", tty);
- WARN_ON(1);
- return;
- }
- tty_kref_get(tty);
- mutex_lock_nested(&tty->legacy_mutex, subclass);
-}
-
-void __lockfunc tty_lock(struct tty_struct *tty)
-{
- return tty_lock_nested(tty, TTY_MUTEX_NORMAL);
+ mutex_lock(&big_tty_mutex);
}
EXPORT_SYMBOL(tty_lock);
-void __lockfunc tty_unlock(struct tty_struct *tty)
+void __lockfunc tty_unlock(void)
{
- if (tty->magic != TTY_MAGIC) {
- printk(KERN_ERR "U Bad %p\n", tty);
- WARN_ON(1);
- return;
- }
- mutex_unlock(&tty->legacy_mutex);
- tty_kref_put(tty);
+ mutex_unlock(&big_tty_mutex);
}
EXPORT_SYMBOL(tty_unlock);
-
-/*
- * Getting the big tty mutex for a pair of ttys with lock ordering
- * On a non pty/tty pair tty2 can be NULL which is just fine.
- */
-void __lockfunc tty_lock_pair(struct tty_struct *tty,
- struct tty_struct *tty2)
-{
- if (tty < tty2) {
- tty_lock(tty);
- tty_lock_nested(tty2, TTY_MUTEX_NESTED);
- } else {
- if (tty2 && tty2 != tty)
- tty_lock(tty2);
- tty_lock_nested(tty, TTY_MUTEX_NESTED);
- }
-}
-EXPORT_SYMBOL(tty_lock_pair);
-
-void __lockfunc tty_unlock_pair(struct tty_struct *tty,
- struct tty_struct *tty2)
-{
- tty_unlock(tty);
- if (tty2 && tty2 != tty)
- tty_unlock(tty2);
-}
-EXPORT_SYMBOL(tty_unlock_pair);
/* block if port is in the process of being closed */
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
- wait_event_interruptible_tty(tty, port->close_wait,
+ wait_event_interruptible_tty(port->close_wait,
!(port->flags & ASYNC_CLOSING));
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
retval = -ERESTARTSYS;
break;
}
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
finish_wait(&port->open_wait, &wait);
struct mutex ldisc_mutex;
struct tty_ldisc *ldisc;
- struct mutex legacy_mutex;
struct mutex termios_mutex;
spinlock_t ctrl_lock;
/* Termios values are protected by the termios mutex */
/* tty_mutex.c */
/* functions for preparation of BKL removal */
-extern void __lockfunc tty_lock(struct tty_struct *tty);
-extern void __lockfunc tty_unlock(struct tty_struct *tty);
-extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
- struct tty_struct *tty2);
-extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
- struct tty_struct *tty2);
+extern void __lockfunc tty_lock(void) __acquires(tty_lock);
+extern void __lockfunc tty_unlock(void) __releases(tty_lock);
/*
* this shall be called only from where BTM is held (like close)
static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
long timeout)
{
- tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
+ tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */
tty_wait_until_sent(tty, timeout);
- tty_lock(tty);
+ tty_lock();
}
/*
*
* Do not use in new code.
*/
-#define wait_event_interruptible_tty(tty, wq, condition) \
+#define wait_event_interruptible_tty(wq, condition) \
({ \
int __ret = 0; \
if (!(condition)) { \
- __wait_event_interruptible_tty(tty, wq, condition, __ret); \
+ __wait_event_interruptible_tty(wq, condition, __ret); \
} \
__ret; \
})
-#define __wait_event_interruptible_tty(tty, wq, condition, ret) \
+#define __wait_event_interruptible_tty(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
\
if (condition) \
break; \
if (!signal_pending(current)) { \
- tty_unlock(tty); \
+ tty_unlock(); \
schedule(); \
- tty_lock(tty); \
+ tty_lock(); \
continue; \
} \
ret = -ERESTARTSYS; \
break;
}
- tty_unlock(tty);
+ tty_unlock();
schedule();
- tty_lock(tty);
+ tty_lock();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&dev->wait, &wait);
projects / linux-2.6-block.git / commitdiff