Merge tag 'tty-3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are some tty and serial driver fixes for things reported
  recently"

* tag 'tty-3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: Fix lockless tty buffer race
  Revert "tty: Fix race condition between __tty_buffer_request_room and flush_to_ldisc"
  drivers/tty/hvc: don't free hvc_console_setup after init
  n_tty: Fix n_tty_write crash when echoing in raw mode
  tty: serial: 8250_core.c Bug fix for Exar chips.

drivers/tty/hvc/hvc_console.c

@@ -190,7 +190,7 @@ static struct tty_driver *hvc_console_device(struct console *c, int *index)
 	return hvc_driver;
 }
 
-static int __init hvc_console_setup(struct console *co, char *options)
+static int hvc_console_setup(struct console *co, char *options)
 {	
 	if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
 		return -ENODEV;

drivers/tty/n_tty.c

@@ -2353,8 +2353,12 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
 			if (tty->ops->flush_chars)
 				tty->ops->flush_chars(tty);
 		} else {
+			struct n_tty_data *ldata = tty->disc_data;
+
 			while (nr > 0) {
+				mutex_lock(&ldata->output_lock);
 				c = tty->ops->write(tty, b, nr);
+				mutex_unlock(&ldata->output_lock);
 				if (c < 0) {
 					retval = c;
 					goto break_out;

drivers/tty/serial/8250/8250_core.c

@@ -555,7 +555,7 @@ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
 	 */
 	if ((p->port.type == PORT_XR17V35X) ||
 	   (p->port.type == PORT_XR17D15X)) {
-		serial_out(p, UART_EXAR_SLEEP, 0xff);
+		serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0);
 		return;
 	}
 

drivers/tty/tty_buffer.c

@@ -255,16 +255,15 @@ static int __tty_buffer_request_room(struct tty_port *port, size_t size,
 	if (change || left < size) {
 		/* This is the slow path - looking for new buffers to use */
 		if ((n = tty_buffer_alloc(port, size)) != NULL) {
-			unsigned long iflags;
-
 			n->flags = flags;
 			buf->tail = n;
-
-			spin_lock_irqsave(&buf->flush_lock, iflags);
 			b->commit = b->used;
+			/* paired w/ barrier in flush_to_ldisc(); ensures the
+			 * latest commit value can be read before the head is
+			 * advanced to the next buffer
+			 */
+			smp_wmb();
 			b->next = n;
-			spin_unlock_irqrestore(&buf->flush_lock, iflags);
-
 		} else if (change)
 			size = 0;
 		else
@@ -448,27 +447,28 @@ static void flush_to_ldisc(struct work_struct *work)
 	mutex_lock(&buf->lock);
 
 	while (1) {
-		unsigned long flags;
 		struct tty_buffer *head = buf->head;
+		struct tty_buffer *next;
 		int count;
 
 		/* Ldisc or user is trying to gain exclusive access */
 		if (atomic_read(&buf->priority))
 			break;
 
-		spin_lock_irqsave(&buf->flush_lock, flags);
+		next = head->next;
+		/* paired w/ barrier in __tty_buffer_request_room();
+		 * ensures commit value read is not stale if the head
+		 * is advancing to the next buffer
+		 */
+		smp_rmb();
 		count = head->commit - head->read;
 		if (!count) {
-			if (head->next == NULL) {
-				spin_unlock_irqrestore(&buf->flush_lock, flags);
+			if (next == NULL)
 				break;
-			}
-			buf->head = head->next;
-			spin_unlock_irqrestore(&buf->flush_lock, flags);
+			buf->head = next;
 			tty_buffer_free(port, head);
 			continue;
 		}
-		spin_unlock_irqrestore(&buf->flush_lock, flags);
 
 		count = receive_buf(tty, head, count);
 		if (!count)
@@ -523,7 +523,6 @@ void tty_buffer_init(struct tty_port *port)
 	struct tty_bufhead *buf = &port->buf;
 
 	mutex_init(&buf->lock);
-	spin_lock_init(&buf->flush_lock);
 	tty_buffer_reset(&buf->sentinel, 0);
 	buf->head = &buf->sentinel;
 	buf->tail = &buf->sentinel;

include/linux/tty.h

@@ -61,7 +61,6 @@ struct tty_bufhead {
 	struct tty_buffer *head;	/* Queue head */
 	struct work_struct work;
 	struct mutex	   lock;
-	spinlock_t	   flush_lock;
 	atomic_t	   priority;
 	struct tty_buffer sentinel;
 	struct llist_head free;		/* Free queue head */