Merge tag 'tty-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here is the big tty and serial driver update for 4.4-rc1.

  Lots of serial driver updates and a few small tty core changes.  Full
  details in the shortlog.

  All of these have been in linux-next for a while"

* tag 'tty-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (148 commits)
  tty: Use unbound workqueue for all input workers
  tty: Abstract tty buffer work
  tty: Prevent tty teardown during tty_write_message()
  tty: core: Use correct spinlock flavor in tiocspgrp()
  tty: Combine SIGTTOU/SIGTTIN handling
  serial: amba-pl011: fix incorrect integer size in pl011_fifo_to_tty()
  ttyFDC: Fix build problems due to use of module_{init,exit}
  tty: remove unneeded return statement
  serial: 8250_mid: add support for DMA engine handling from UART MMIO
  dmaengine: hsu: remove platform data
  dmaengine: hsu: introduce stubs for the exported functions
  dmaengine: hsu: make the UART driver in control of selecting this driver
  serial: fix mctrl helper functions
  serial: 8250_pci: Intel MID UART support to its own driver
  serial: fsl_lpuart: add earlycon support
  tty: disable unbind for old 74xx based serial/mpsc console port
  serial: pl011: Spelling s/clocks-names/clock-names/
  n_tty: Remove reader wakeups for TTY_BREAK/TTY_PARITY chars
  tty: synclink, fix indentation
  serial: at91, fix rs485 properties
  ...

1 files changed, 4 insertions, 24 deletions

diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 40b31835f80b..482f33f20043 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -22,7 +22,6 @@ void tty_port_init(struct tty_port *port)
 	memset(port, 0, sizeof(*port));
 	tty_buffer_init(port);
 	init_waitqueue_head(&port->open_wait);
-	init_waitqueue_head(&port->close_wait);
 	init_waitqueue_head(&port->delta_msr_wait);
 	mutex_init(&port->mutex);
 	mutex_init(&port->buf_mutex);
@@ -131,7 +130,7 @@ EXPORT_SYMBOL(tty_port_free_xmit_buf);
  */
 void tty_port_destroy(struct tty_port *port)
 {
-	cancel_work_sync(&port->buf.work);
+	tty_buffer_cancel_work(port);
 	tty_buffer_free_all(port);
 }
 EXPORT_SYMBOL(tty_port_destroy);
@@ -363,16 +362,6 @@ int tty_port_block_til_ready(struct tty_port *port,
 	unsigned long flags;
 	DEFINE_WAIT(wait);
 
-	/* block if port is in the process of being closed */
-	if (port->flags & ASYNC_CLOSING) {
-		wait_event_interruptible_tty(tty, port->close_wait,
-				!(port->flags & ASYNC_CLOSING));
-		if (port->flags & ASYNC_HUP_NOTIFY)
-			return -EAGAIN;
-		else
-			return -ERESTARTSYS;
-	}
-
 	/* if non-blocking mode is set we can pass directly to open unless
 	   the port has just hung up or is in another error state */
 	if (tty->flags & (1 << TTY_IO_ERROR)) {
@@ -423,8 +412,7 @@ int tty_port_block_til_ready(struct tty_port *port,
 		 * Never ask drivers if CLOCAL is set, this causes troubles
 		 * on some hardware.
 		 */
-		if (!(port->flags & ASYNC_CLOSING) &&
-				(do_clocal || tty_port_carrier_raised(port)))
+		if (do_clocal || tty_port_carrier_raised(port))
 			break;
 		if (signal_pending(current)) {
 			retval = -ERESTARTSYS;
@@ -463,10 +451,7 @@ static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)
 	schedule_timeout_interruptible(timeout);
 }
 
-/* Caller holds tty lock.
- * NB: may drop and reacquire tty lock (in tty_wait_until_sent_from_close())
- * so tty and tty port may have changed state (but not hung up or reopened).
- */
+/* Caller holds tty lock. */
 int tty_port_close_start(struct tty_port *port,
 				struct tty_struct *tty, struct file *filp)
 {
@@ -502,7 +487,7 @@ int tty_port_close_start(struct tty_port *port,
 		if (tty->flow_stopped)
 			tty_driver_flush_buffer(tty);
 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
-			tty_wait_until_sent_from_close(tty, port->closing_wait);
+			tty_wait_until_sent(tty, port->closing_wait);
 		if (port->drain_delay)
 			tty_port_drain_delay(port, tty);
 	}
@@ -534,7 +519,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
 		wake_up_interruptible(&port->open_wait);
 	}
 	port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
-	wake_up_interruptible(&port->close_wait);
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 EXPORT_SYMBOL(tty_port_close_end);
@@ -543,10 +527,6 @@ EXPORT_SYMBOL(tty_port_close_end);
  * tty_port_close
  *
  * Caller holds tty lock
- *
- * NB: may drop and reacquire tty lock (in tty_port_close_start()->
- * tty_wait_until_sent_from_close()) so tty and tty_port may have changed
- * state (but not hung up or reopened).
  */
 void tty_port_close(struct tty_port *port, struct tty_struct *tty,
 							struct file *filp)