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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/bluetooth/hci_ldisc.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *
34  *  Bluetooth HCI UART driver
....@@ -5,22 +6,6 @@
56  *  Copyright (C) 2000-2001  Qualcomm Incorporated
67  *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
78  *  Copyright (C) 2004-2005  Marcel Holtmann <marcel@holtmann.org>
8
- *
9
- *
10
- *  This program is free software; you can redistribute it and/or modify
11
- *  it under the terms of the GNU General Public License as published by
12
- *  the Free Software Foundation; either version 2 of the License, or
13
- *  (at your option) any later version.
14
- *
15
- *  This program is distributed in the hope that it will be useful,
16
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18
- *  GNU General Public License for more details.
19
- *
20
- *  You should have received a copy of the GNU General Public License
21
- *  along with this program; if not, write to the Free Software
22
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23
- *
249  */
2510 
2611 #include <linux/module.h>
....@@ -142,10 +127,9 @@
142127 	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
143128 		goto no_schedule;
144129 
145
-	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
146
-		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
130
+	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
131
+	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
147132 		goto no_schedule;
148
-	}
149133 
150134 	BT_DBG("");
151135 
....@@ -194,10 +178,11 @@
194178 		kfree_skb(skb);
195179 	}
196180 
181
+	clear_bit(HCI_UART_SENDING, &hu->tx_state);
197182 	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
198183 		goto restart;
199184 
200
-	clear_bit(HCI_UART_SENDING, &hu->tx_state);
185
+	wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
201186 }
202187 
203188 void hci_uart_init_work(struct work_struct *work)
....@@ -231,6 +216,13 @@
231216 	schedule_work(&hu->init_ready);
232217 
233218 	return 0;
219
+}
220
+
221
+int hci_uart_wait_until_sent(struct hci_uart *hu)
222
+{
223
+	return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
224
+				   TASK_INTERRUPTIBLE,
225
+				   msecs_to_jiffies(2000));
234226 }
235227 
236228 /* ------- Interface to HCI layer ------ */
....@@ -295,9 +287,6 @@
295287 		percpu_up_read(&hu->proto_lock);
296288 		return -EUNATCH;
297289 	}
298
-
299
-	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
300
-		return -EUNATCH;
301290 
302291 	hu->proto->enqueue(hu, skb);
303292 	percpu_up_read(&hu->proto_lock);
....@@ -506,6 +495,11 @@
506495 		BT_ERR("Can't allocate control structure");
507496 		return -ENFILE;
508497 	}
498
+	if (percpu_init_rwsem(&hu->proto_lock)) {
499
+		BT_ERR("Can't allocate semaphore structure");
500
+		kfree(hu);
501
+		return -ENOMEM;
502
+	}
509503 
510504 	tty->disc_data = hu;
511505 	hu->tty = tty;
....@@ -517,8 +511,6 @@
517511 
518512 	INIT_WORK(&hu->init_ready, hci_uart_init_work);
519513 	INIT_WORK(&hu->write_work, hci_uart_write_work);
520
-
521
-	percpu_init_rwsem(&hu->proto_lock);
522514 
523515 	/* Flush any pending characters in the driver */
524516 	tty_driver_flush_buffer(tty);
....@@ -817,7 +809,8 @@
817809  * We don't provide read/write/poll interface for user space.
818810  */
819811 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
820
-				 unsigned char __user *buf, size_t nr)
812
+				 unsigned char *buf, size_t nr,
813
+				 void **cookie, unsigned long offset)
821814 {
822815 	return 0;
823816 }
....@@ -834,28 +827,28 @@
834827 	return 0;
835828 }
836829 
830
+static struct tty_ldisc_ops hci_uart_ldisc = {
831
+	.owner		= THIS_MODULE,
832
+	.magic		= TTY_LDISC_MAGIC,
833
+	.name		= "n_hci",
834
+	.open		= hci_uart_tty_open,
835
+	.close		= hci_uart_tty_close,
836
+	.read		= hci_uart_tty_read,
837
+	.write		= hci_uart_tty_write,
838
+	.ioctl		= hci_uart_tty_ioctl,
839
+	.compat_ioctl	= hci_uart_tty_ioctl,
840
+	.poll		= hci_uart_tty_poll,
841
+	.receive_buf	= hci_uart_tty_receive,
842
+	.write_wakeup	= hci_uart_tty_wakeup,
843
+};
844
+
837845 static int __init hci_uart_init(void)
838846 {
839
-	static struct tty_ldisc_ops hci_uart_ldisc;
840847 	int err;
841848 
842849 	BT_INFO("HCI UART driver ver %s", VERSION);
843850 
844851 	/* Register the tty discipline */
845
-
846
-	memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
847
-	hci_uart_ldisc.magic		= TTY_LDISC_MAGIC;
848
-	hci_uart_ldisc.name		= "n_hci";
849
-	hci_uart_ldisc.open		= hci_uart_tty_open;
850
-	hci_uart_ldisc.close		= hci_uart_tty_close;
851
-	hci_uart_ldisc.read		= hci_uart_tty_read;
852
-	hci_uart_ldisc.write		= hci_uart_tty_write;
853
-	hci_uart_ldisc.ioctl		= hci_uart_tty_ioctl;
854
-	hci_uart_ldisc.poll		= hci_uart_tty_poll;
855
-	hci_uart_ldisc.receive_buf	= hci_uart_tty_receive;
856
-	hci_uart_ldisc.write_wakeup	= hci_uart_tty_wakeup;
857
-	hci_uart_ldisc.owner		= THIS_MODULE;
858
-
859852 	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
860853 	if (err) {
861854 		BT_ERR("HCI line discipline registration failed. (%d)", err);