X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fbluetooth%2Frfcomm%2Ftty.c;h=5d163571d3f7ce494fdc578914f3111f15c5403f;hb=407d819cf0fd54c6fc1138a509225696aecafd15;hp=c3f749abb2d07a1f99274fc71873d86e02f7e9b4;hpb=49115b7cb1483a14c557666b61fe81d3c23780d6;p=pandora-kernel.git

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index c3f749abb2d0..5d163571d3f7 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -23,8 +23,6 @@
 
 /*
  * RFCOMM TTY.
- *
- * $Id: tty.c,v 1.24 2002/10/03 01:54:38 holtmann Exp $
  */
 
 #include <linux/module.h>
@@ -77,6 +75,8 @@ struct rfcomm_dev {
 	struct device		*tty_dev;
 
 	atomic_t 		wmem_alloc;
+
+	struct sk_buff_head	pending;
 };
 
 static LIST_HEAD(rfcomm_dev_list);
@@ -264,13 +264,34 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 	init_waitqueue_head(&dev->wait);
 	tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
 
+	skb_queue_head_init(&dev->pending);
+
 	rfcomm_dlc_lock(dlc);
+
+	if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
+		struct sock *sk = dlc->owner;
+		struct sk_buff *skb;
+
+		BUG_ON(!sk);
+
+		rfcomm_dlc_throttle(dlc);
+
+		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
+			skb_orphan(skb);
+			skb_queue_tail(&dev->pending, skb);
+			atomic_sub(skb->len, &sk->sk_rmem_alloc);
+		}
+	}
+
 	dlc->data_ready   = rfcomm_dev_data_ready;
 	dlc->state_change = rfcomm_dev_state_change;
 	dlc->modem_status = rfcomm_dev_modem_status;
 
 	dlc->owner = dev;
 	dev->dlc   = dlc;
+
+	rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
+
 	rfcomm_dlc_unlock(dlc);
 
 	/* It's safe to call __module_get() here because socket already
@@ -539,11 +560,16 @@ static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 	struct rfcomm_dev *dev = dlc->owner;
 	struct tty_struct *tty;
 
-	if (!dev || !(tty = dev->tty)) {
+	if (!dev) {
 		kfree_skb(skb);
 		return;
 	}
 
+	if (!(tty = dev->tty) || !skb_queue_empty(&dev->pending)) {
+		skb_queue_tail(&dev->pending, skb);
+		return;
+	}
+
 	BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
 
 	tty_insert_flip_string(tty, skb->data, skb->len);
@@ -566,11 +592,22 @@ static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 	if (dlc->state == BT_CLOSED) {
 		if (!dev->tty) {
 			if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
-				if (rfcomm_dev_get(dev->id) == NULL)
+				/* Drop DLC lock here to avoid deadlock
+				 * 1. rfcomm_dev_get will take rfcomm_dev_lock
+				 *    but in rfcomm_dev_add there's lock order:
+				 *    rfcomm_dev_lock -> dlc lock
+				 * 2. rfcomm_dev_put will deadlock if it's
+				 *    the last reference
+				 */
+				rfcomm_dlc_unlock(dlc);
+				if (rfcomm_dev_get(dev->id) == NULL) {
+					rfcomm_dlc_lock(dlc);
 					return;
+				}
 
 				rfcomm_dev_del(dev);
 				rfcomm_dev_put(dev);
+				rfcomm_dlc_lock(dlc);
 			}
 		} else
 			tty_hangup(dev->tty);
@@ -616,6 +653,30 @@ static void rfcomm_tty_wakeup(unsigned long arg)
 #endif
 }
 
+static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
+{
+	struct tty_struct *tty = dev->tty;
+	struct sk_buff *skb;
+	int inserted = 0;
+
+	if (!tty)
+		return;
+
+	BT_DBG("dev %p tty %p", dev, tty);
+
+	rfcomm_dlc_lock(dev->dlc);
+
+	while ((skb = skb_dequeue(&dev->pending))) {
+		inserted += tty_insert_flip_string(tty, skb->data, skb->len);
+		kfree_skb(skb);
+	}
+
+	rfcomm_dlc_unlock(dev->dlc);
+
+	if (inserted > 0)
+		tty_flip_buffer_push(tty);
+}
+
 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 {
 	DECLARE_WAITQUEUE(wait, current);
@@ -680,6 +741,10 @@ static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 	if (err == 0)
 		device_move(dev->tty_dev, rfcomm_get_device(dev));
 
+	rfcomm_tty_copy_pending(dev);
+
+	rfcomm_dlc_unthrottle(dev->dlc);
+
 	return err;
 }
 
@@ -1112,6 +1177,7 @@ int rfcomm_init_ttys(void)
 	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_lflag &= ~ICANON;
 	tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
 
 	if (tty_register_driver(rfcomm_tty_driver)) {