tty_lock: Localise the lock (d29f3ef3) · Commits · e / devices / android_kernel_samsung_universal8895

drivers/staging/serial/68360serial.c

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1859,9 +1859,9 @@ static int block_til_ready(struct tty_struct tty, struct file filp,
	printk("block_til_ready blocking: ttys%d, count = %d\n",		printk("block_til_ready blocking: ttys%d, count = %d\n",
	info->line, state->count);		info->line, state->count);
	#endif		#endif
	tty_unlock();		tty_unlock(tty);
	schedule();		schedule();
	tty_lock();		tty_lock(tty);
	}		}
	current->state = TASK_RUNNING;		current->state = TASK_RUNNING;
	remove_wait_queue(&info->open_wait, &wait);		remove_wait_queue(&info->open_wait, &wait);

drivers/tty/amiserial.c

+6 −6

Original line number	Original line	Diff line number	Diff line
	@@ -1033,7 +1033,7 @@ static int get_serial_info(struct tty_struct tty, struct serial_state state,
	if (!retinfo)		if (!retinfo)
	return -EFAULT;		return -EFAULT;
	memset(&tmp, 0, sizeof(tmp));		memset(&tmp, 0, sizeof(tmp));
	tty_lock();		tty_lock(tty);
	tmp.line = tty->index;		tmp.line = tty->index;
	tmp.port = state->port;		tmp.port = state->port;
	tmp.flags = state->tport.flags;		tmp.flags = state->tport.flags;
	@@ -1042,7 +1042,7 @@ static int get_serial_info(struct tty_struct tty, struct serial_state state,
	tmp.close_delay = state->tport.close_delay;		tmp.close_delay = state->tport.close_delay;
	tmp.closing_wait = state->tport.closing_wait;		tmp.closing_wait = state->tport.closing_wait;
	tmp.custom_divisor = state->custom_divisor;		tmp.custom_divisor = state->custom_divisor;
	tty_unlock();		tty_unlock(tty);
	if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))		if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
	return -EFAULT;		return -EFAULT;
	return 0;		return 0;
	@@ -1059,12 +1059,12 @@ static int set_serial_info(struct tty_struct tty, struct serial_state state,
	if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))		if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
	return -EFAULT;		return -EFAULT;

	tty_lock();		tty_lock(tty);
	change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) \|\|		change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) \|\|
	new_serial.custom_divisor != state->custom_divisor;		new_serial.custom_divisor != state->custom_divisor;
	if (new_serial.irq \|\| new_serial.port != state->port \|\|		if (new_serial.irq \|\| new_serial.port != state->port \|\|
	new_serial.xmit_fifo_size != state->xmit_fifo_size) {		new_serial.xmit_fifo_size != state->xmit_fifo_size) {
	tty_unlock();		tty_unlock(tty);
	return -EINVAL;		return -EINVAL;
	}		}

	@@ -1084,7 +1084,7 @@ static int set_serial_info(struct tty_struct tty, struct serial_state state,
	}		}

	if (new_serial.baud_base < 9600) {		if (new_serial.baud_base < 9600) {
	tty_unlock();		tty_unlock(tty);
	return -EINVAL;		return -EINVAL;
	}		}

	@@ -1116,7 +1116,7 @@ check_and_exit:
	}		}
	} else		} else
	retval = startup(tty, state);		retval = startup(tty, state);
	tty_unlock();		tty_unlock(tty);
	return retval;		return retval;
	}		}

drivers/tty/cyclades.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1599,7 +1599,7 @@ static int cy_open(struct tty_struct tty, struct file filp)
	* If the port is the middle of closing, bail out now		* If the port is the middle of closing, bail out now
	*/		*/
	if (tty_hung_up_p(filp) \|\| (info->port.flags & ASYNC_CLOSING)) {		if (tty_hung_up_p(filp) \|\| (info->port.flags & ASYNC_CLOSING)) {
	wait_event_interruptible_tty(info->port.close_wait,		wait_event_interruptible_tty(tty, info->port.close_wait,
	!(info->port.flags & ASYNC_CLOSING));		!(info->port.flags & ASYNC_CLOSING));
	return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;		return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;
	}		}

drivers/tty/n_r3964.c

+6 −5

Original line number	Original line	Diff line number	Diff line
	@@ -1065,7 +1065,8 @@ static ssize_t r3964_read(struct tty_struct tty, struct file file,

	TRACE_L("read()");		TRACE_L("read()");

	tty_lock();		/* FIXME: should use a private lock */
			tty_lock(tty);

	pClient = findClient(pInfo, task_pid(current));		pClient = findClient(pInfo, task_pid(current));
	if (pClient) {		if (pClient) {
	@@ -1077,7 +1078,7 @@ static ssize_t r3964_read(struct tty_struct tty, struct file file,
	goto unlock;		goto unlock;
	}		}
	/* block until there is a message: */		/* block until there is a message: */
	wait_event_interruptible_tty(pInfo->read_wait,		wait_event_interruptible_tty(tty, pInfo->read_wait,
	(pMsg = remove_msg(pInfo, pClient)));		(pMsg = remove_msg(pInfo, pClient)));
	}		}

	@@ -1107,7 +1108,7 @@ static ssize_t r3964_read(struct tty_struct tty, struct file file,
	}		}
	ret = -EPERM;		ret = -EPERM;
	unlock:		unlock:
	tty_unlock();		tty_unlock(tty);
	return ret;		return ret;
	}		}

	@@ -1156,7 +1157,7 @@ static ssize_t r3964_write(struct tty_struct tty, struct file file,
	pHeader->locks = 0;		pHeader->locks = 0;
	pHeader->owner = NULL;		pHeader->owner = NULL;

	tty_lock();		tty_lock(tty);

	pClient = findClient(pInfo, task_pid(current));		pClient = findClient(pInfo, task_pid(current));
	if (pClient) {		if (pClient) {
	@@ -1175,7 +1176,7 @@ static ssize_t r3964_write(struct tty_struct tty, struct file file,
	add_tx_queue(pInfo, pHeader);		add_tx_queue(pInfo, pHeader);
	trigger_transmit(pInfo);		trigger_transmit(pInfo);

	tty_unlock();		tty_unlock(tty);

	return 0;		return 0;
	}		}

drivers/tty/pty.c

+13 −10

Original line number	Original line	Diff line number	Diff line
	@@ -47,6 +47,7 @@ static void pty_close(struct tty_struct tty, struct file filp)
	wake_up_interruptible(&tty->read_wait);		wake_up_interruptible(&tty->read_wait);
	wake_up_interruptible(&tty->write_wait);		wake_up_interruptible(&tty->write_wait);
	tty->packet = 0;		tty->packet = 0;
			/* Review - krefs on tty_link ?? */
	if (!tty->link)		if (!tty->link)
	return;		return;
	tty->link->packet = 0;		tty->link->packet = 0;
	@@ -62,9 +63,7 @@ static void pty_close(struct tty_struct tty, struct file filp)
	mutex_unlock(&devpts_mutex);		mutex_unlock(&devpts_mutex);
	}		}
	#endif		#endif
	tty_unlock();
	tty_vhangup(tty->link);		tty_vhangup(tty->link);
	tty_lock();
	}		}
	}		}

	@@ -622,26 +621,29 @@ static int ptmx_open(struct inode inode, struct file filp)
	return retval;		return retval;

	/* find a device that is not in use. */		/* find a device that is not in use. */
	tty_lock();		mutex_lock(&devpts_mutex);
	index = devpts_new_index(inode);		index = devpts_new_index(inode);
	tty_unlock();
	if (index < 0) {		if (index < 0) {
	retval = index;		retval = index;
	goto err_file;		goto err_file;
	}		}

			mutex_unlock(&devpts_mutex);

	mutex_lock(&tty_mutex);		mutex_lock(&tty_mutex);
	mutex_lock(&devpts_mutex);		mutex_lock(&devpts_mutex);
	tty = tty_init_dev(ptm_driver, index);		tty = tty_init_dev(ptm_driver, index);
	mutex_unlock(&devpts_mutex);
	tty_lock();
	mutex_unlock(&tty_mutex);

	if (IS_ERR(tty)) {		if (IS_ERR(tty)) {
	retval = PTR_ERR(tty);		retval = PTR_ERR(tty);
	goto out;		goto out;
	}		}

			/* The tty returned here is locked so we can safely
			drop the mutex */
			mutex_unlock(&devpts_mutex);
			mutex_unlock(&tty_mutex);

	set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */		set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */

	tty_add_file(tty, filp);		tty_add_file(tty, filp);
	@@ -654,16 +656,17 @@ static int ptmx_open(struct inode inode, struct file filp)
	if (retval)		if (retval)
	goto err_release;		goto err_release;

	tty_unlock();		tty_unlock(tty);
	return 0;		return 0;
	err_release:		err_release:
	tty_unlock();		tty_unlock(tty);
	tty_release(inode, filp);		tty_release(inode, filp);
	return retval;		return retval;
	out:		out:
			mutex_unlock(&tty_mutex);
	devpts_kill_index(inode, index);		devpts_kill_index(inode, index);
	tty_unlock();
	err_file:		err_file:
			mutex_unlock(&devpts_mutex);
	tty_free_file(filp);		tty_free_file(filp);
	return retval;		return retval;
	}		}