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, 21 insertions, 45 deletions

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 856686d6dcdb..d72cd736bdc6 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -385,32 +385,6 @@ static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 	}
 }
 
-static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
-				     unsigned long ufstat);
-
-static void uart_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
-{
-	struct uart_port *port = &ourport->port;
-	struct tty_port *tty = &port->state->port;
-	unsigned int ch, ufstat;
-	unsigned int count;
-
-	ufstat = rd_regl(port, S3C2410_UFSTAT);
-	count = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
-
-	if (!count)
-		return;
-
-	while (count-- > 0) {
-		ch = rd_regb(port, S3C2410_URXH);
-
-		ourport->port.icount.rx++;
-		tty_insert_flip_char(tty, ch, TTY_NORMAL);
-	}
-
-	tty_flip_buffer_push(tty);
-}
-
 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
@@ -573,7 +547,9 @@ static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
 	ourport->rx_mode = S3C24XX_RX_PIO;
 }
 
-static irqreturn_t s3c24xx_serial_rx_chars_dma(int irq, void *dev_id)
+static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
+
+static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
 {
 	unsigned int utrstat, ufstat, received;
 	struct s3c24xx_uart_port *ourport = dev_id;
@@ -606,7 +582,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_dma(int irq, void *dev_id)
 		enable_rx_pio(ourport);
 	}
 
-	uart_rx_drain_fifo(ourport);
+	s3c24xx_serial_rx_drain_fifo(ourport);
 
 	if (tty) {
 		tty_flip_buffer_push(t);
@@ -621,16 +597,12 @@ finish:
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
+static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 {
-	struct s3c24xx_uart_port *ourport = dev_id;
 	struct uart_port *port = &ourport->port;
 	unsigned int ufcon, ch, flag, ufstat, uerstat;
-	unsigned long flags;
 	int max_count = port->fifosize;
 
-	spin_lock_irqsave(&port->lock, flags);
-
 	while (max_count-- > 0) {
 		ufcon = rd_regl(port, S3C2410_UFCON);
 		ufstat = rd_regl(port, S3C2410_UFSTAT);
@@ -654,9 +626,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
 					ufcon |= S3C2410_UFCON_RESETRX;
 					wr_regl(port, S3C2410_UFCON, ufcon);
 					rx_enabled(port) = 1;
-					spin_unlock_irqrestore(&port->lock,
-							flags);
-					goto out;
+					return;
 				}
 				continue;
 			}
@@ -676,7 +646,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
 				dbg("break!\n");
 				port->icount.brk++;
 				if (uart_handle_break(port))
-					goto ignore_char;
+					continue; /* Ignore character */
 			}
 
 			if (uerstat & S3C2410_UERSTAT_FRAME)
@@ -696,19 +666,25 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
 		}
 
 		if (uart_handle_sysrq_char(port, ch))
-			goto ignore_char;
+			continue; /* Ignore character */
 
 		uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
 				 ch, flag);
-
-ignore_char:
-		continue;
 	}
 
-	spin_unlock_irqrestore(&port->lock, flags);
 	tty_flip_buffer_push(&port->state->port);
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
+{
+	struct s3c24xx_uart_port *ourport = dev_id;
+	struct uart_port *port = &ourport->port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	s3c24xx_serial_rx_drain_fifo(ourport);
+	spin_unlock_irqrestore(&port->lock, flags);
 
-out:
 	return IRQ_HANDLED;
 }
 
@@ -718,8 +694,8 @@ static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
 	struct s3c24xx_uart_port *ourport = dev_id;
 
 	if (ourport->dma && ourport->dma->rx_chan)
-		return s3c24xx_serial_rx_chars_dma(irq, dev_id);
-	return s3c24xx_serial_rx_chars_pio(irq, dev_id);
+		return s3c24xx_serial_rx_chars_dma(dev_id);
+	return s3c24xx_serial_rx_chars_pio(dev_id);
 }
 
 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)