From: Gianluca Anzolin Date: Mon, 29 Jul 2013 15:08:11 +0000 (+0200) Subject: Bluetooth: Implement .activate, .shutdown and .carrier_raised methods X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cad348a17e170451ea8688b532a6ca3e98c63b60;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git Bluetooth: Implement .activate, .shutdown and .carrier_raised methods Implement .activate, .shutdown and .carrier_raised methods of tty_port to manage the dlc, moving the code from rfcomm_tty_install() and rfcomm_tty_cleanup() functions. At the same time the tty .open()/.close() and .hangup() methods are changed to use the tty_port helpers that properly call the aforementioned tty_port methods. Signed-off-by: Gianluca Anzolin Reviewed-by: Peter Hurley Signed-off-by: Gustavo Padovan --- diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index 73dd61530130..583f7135c811 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -58,7 +58,6 @@ struct rfcomm_dev { uint modem_status; struct rfcomm_dlc *dlc; - wait_queue_head_t wait; struct device *tty_dev; @@ -104,8 +103,39 @@ static void rfcomm_dev_destruct(struct tty_port *port) module_put(THIS_MODULE); } +/* device-specific initialization: open the dlc */ +static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); + + return rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel); +} + +/* we block the open until the dlc->state becomes BT_CONNECTED */ +static int rfcomm_dev_carrier_raised(struct tty_port *port) +{ + struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); + + return (dev->dlc->state == BT_CONNECTED); +} + +/* device-specific cleanup: close the dlc */ +static void rfcomm_dev_shutdown(struct tty_port *port) +{ + struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); + + if (dev->tty_dev->parent) + device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST); + + /* close the dlc */ + rfcomm_dlc_close(dev->dlc, 0); +} + static const struct tty_port_operations rfcomm_port_ops = { .destruct = rfcomm_dev_destruct, + .activate = rfcomm_dev_activate, + .shutdown = rfcomm_dev_shutdown, + .carrier_raised = rfcomm_dev_carrier_raised, }; static struct rfcomm_dev *__rfcomm_dev_get(int id) @@ -228,7 +258,6 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc) tty_port_init(&dev->port); dev->port.ops = &rfcomm_port_ops; - init_waitqueue_head(&dev->wait); skb_queue_head_init(&dev->pending); @@ -563,9 +592,12 @@ static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err) BT_DBG("dlc %p dev %p err %d", dlc, dev, err); dev->err = err; - wake_up_interruptible(&dev->wait); + if (dlc->state == BT_CONNECTED) { + device_move(dev->tty_dev, rfcomm_get_device(dev), + DPM_ORDER_DEV_AFTER_PARENT); - if (dlc->state == BT_CLOSED) { + wake_up_interruptible(&dev->port.open_wait); + } else if (dlc->state == BT_CLOSED) { tty = tty_port_tty_get(&dev->port); if (!tty) { if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) { @@ -640,17 +672,10 @@ static void rfcomm_tty_cleanup(struct tty_struct *tty) { struct rfcomm_dev *dev = tty->driver_data; - if (dev->tty_dev->parent) - device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST); - - /* Close DLC and dettach TTY */ - rfcomm_dlc_close(dev->dlc, 0); - clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags); rfcomm_dlc_lock(dev->dlc); tty->driver_data = NULL; - dev->port.tty = NULL; rfcomm_dlc_unlock(dev->dlc); tty_port_put(&dev->port); @@ -662,7 +687,6 @@ static void rfcomm_tty_cleanup(struct tty_struct *tty) */ static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) { - DECLARE_WAITQUEUE(wait, current); struct rfcomm_dev *dev; struct rfcomm_dlc *dlc; int err; @@ -676,72 +700,30 @@ static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) /* Attach TTY and open DLC */ rfcomm_dlc_lock(dlc); tty->driver_data = dev; - dev->port.tty = tty; rfcomm_dlc_unlock(dlc); set_bit(RFCOMM_TTY_ATTACHED, &dev->flags); /* install the tty_port */ err = tty_port_install(&dev->port, driver, tty); - if (err < 0) - goto error_no_dlc; - - err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel); - if (err < 0) - goto error_no_dlc; + if (err) + rfcomm_tty_cleanup(tty); - /* Wait for DLC to connect */ - add_wait_queue(&dev->wait, &wait); - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - - if (dlc->state == BT_CLOSED) { - err = -dev->err; - break; - } - - if (dlc->state == BT_CONNECTED) - break; - - if (signal_pending(current)) { - err = -EINTR; - break; - } - - tty_unlock(tty); - schedule(); - tty_lock(tty); - } - set_current_state(TASK_RUNNING); - remove_wait_queue(&dev->wait, &wait); - - if (err < 0) - goto error_no_connection; - - device_move(dev->tty_dev, rfcomm_get_device(dev), - DPM_ORDER_DEV_AFTER_PARENT); - return 0; - -error_no_connection: - rfcomm_dlc_close(dlc, err); -error_no_dlc: - clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags); - tty_port_put(&dev->port); return err; } static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp) { struct rfcomm_dev *dev = tty->driver_data; - unsigned long flags; + int err; BT_DBG("tty %p id %d", tty, tty->index); BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst, dev->channel, dev->port.count); - spin_lock_irqsave(&dev->port.lock, flags); - dev->port.count++; - spin_unlock_irqrestore(&dev->port.lock, flags); + err = tty_port_open(&dev->port, tty, filp); + if (err) + return err; /* * FIXME: rfcomm should use proper flow control for @@ -758,7 +740,6 @@ static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp) static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp) { struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; - unsigned long flags; if (!dev) return; @@ -766,14 +747,10 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp) BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->port.count); - spin_lock_irqsave(&dev->port.lock, flags); - if (!--dev->port.count) { - spin_unlock_irqrestore(&dev->port.lock, flags); + tty_port_close(&dev->port, tty, filp); - if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) - tty_port_put(&dev->port); - } else - spin_unlock_irqrestore(&dev->port.lock, flags); + if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) + tty_port_put(&dev->port); } static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) @@ -1076,7 +1053,7 @@ static void rfcomm_tty_hangup(struct tty_struct *tty) if (!dev) return; - rfcomm_tty_flush_buffer(tty); + tty_port_hangup(&dev->port); if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) { if (rfcomm_dev_get(dev->id) == NULL) @@ -1166,7 +1143,7 @@ int __init rfcomm_init_ttys(void) rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL; rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; rfcomm_tty_driver->init_termios = tty_std_termios; - rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; + rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON; tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);