TTY: switch tty_buffer_request_room to tty_port

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty pointer in
many call sites. Only tty_port will be needed and hence no more
tty_port_tty_get calls in those paths.

Here we start with tty_buffer_request_room.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

8 files changed, 26 insertions, 17 deletions

diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index ad0caf176808..42d5eb0125b3 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -245,7 +245,8 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	int i;
 	unsigned char ch;
 	u8 *cp;
-	struct tty_struct *tty = port->state->port.tty;
+	struct tty_port *tport = &port->state->port;
+	struct tty_struct *tty = tport->tty;
 	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 	cbd_t __iomem *bdp;
 	u16 status;
@@ -276,7 +277,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
 		/* If we have not enough room in tty flip buffer, then we try
 		 * later, which will be the next rx-interrupt or a timeout
 		 */
-		if(tty_buffer_request_room(tty, i) < i) {
+		if (tty_buffer_request_room(tport, i) < i) {
 			printk(KERN_WARNING "No room in flip buffer\n");
 			return;
 		}
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index c4e30b841f94..710ce87ffbeb 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -2356,7 +2356,7 @@ static void receive_chars(struct uart_port *the_port)
 	spin_lock_irqsave(&the_port->lock, pflags);
 	tty = state->port.tty;
 
-	request_count = tty_buffer_request_room(tty, IOC4_MAX_CHARS);
+	request_count = tty_buffer_request_room(&state->port, IOC4_MAX_CHARS);
 
 	if (request_count > 0) {
 		icount = &the_port->icount;
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index 4c00c5550b1a..3969e54744cc 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -521,6 +521,7 @@ void jsm_input(struct jsm_channel *ch)
 {
 	struct jsm_board *bd;
 	struct tty_struct *tp;
+	struct tty_port *port;
 	u32 rmask;
 	u16 head;
 	u16 tail;
@@ -536,7 +537,8 @@ void jsm_input(struct jsm_channel *ch)
 	if (!ch)
 		return;
 
-	tp = ch->uart_port.state->port.tty;
+	port = &ch->uart_port.state->port;
+	tp = port->tty;
 
 	bd = ch->ch_bd;
 	if(!bd)
@@ -600,7 +602,7 @@ void jsm_input(struct jsm_channel *ch)
 		return;
 	}
 
-	len = tty_buffer_request_room(tp, data_len);
+	len = tty_buffer_request_room(port, data_len);
 	n = len;
 
 	/*
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 6a9c6605666a..50366863cfa3 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -937,7 +937,8 @@ static int serial_polled;
 static int mpsc_rx_intr(struct mpsc_port_info *pi)
 {
 	struct mpsc_rx_desc *rxre;
-	struct tty_struct *tty = pi->port.state->port.tty;
+	struct tty_port *port = &pi->port.state->port;
+	struct tty_struct *tty = port->tty;
 	u32	cmdstat, bytes_in, i;
 	int	rc = 0;
 	u8	*bp;
@@ -968,8 +969,7 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 		}
 #endif
 		/* Following use of tty struct directly is deprecated */
-		if (unlikely(tty_buffer_request_room(tty, bytes_in)
-					< bytes_in)) {
+		if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
 			if (tty->low_latency)
 				tty_flip_buffer_push(tty);
 			/*
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 58734d7e746d..776431ff0190 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -339,6 +339,7 @@ static int
 receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 {
 	struct uart_port *port = &max->port;
+	struct tty_port *tport;
 	struct tty_struct *tty;
 	char buf[M3110_RX_FIFO_DEPTH];
 	int r, w, usable;
@@ -347,7 +348,8 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 	if (!port->state)
 		return 0;
 
-	tty = tty_port_tty_get(&port->state->port);
+	tport = &port->state->port;
+	tty = tty_port_tty_get(tport);
 	if (!tty)
 		return 0;
 
@@ -370,7 +372,7 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 	}
 
 	for (r = 0; w; r += usable, w -= usable) {
-		usable = tty_buffer_request_room(tty, w);
+		usable = tty_buffer_request_room(tport, w);
 		if (usable) {
 			tty_insert_flip_string(tty, buf + r, usable);
 			port->icount.rx += usable;
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 8318925fbf6b..4f1774be2a8c 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -629,15 +629,16 @@ static int dma_push_rx(struct eg20t_port *priv, int size)
 	struct tty_struct *tty;
 	int room;
 	struct uart_port *port = &priv->port;
+	struct tty_port *tport = &port->state->port;
 
 	port = &priv->port;
-	tty = tty_port_tty_get(&port->state->port);
+	tty = tty_port_tty_get(tport);
 	if (!tty) {
 		dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
 		return 0;
 	}
 
-	room = tty_buffer_request_room(tty, size);
+	room = tty_buffer_request_room(tport, size);
 
 	if (room < size)
 		dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 61477567423f..cf96314770fb 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -596,7 +596,8 @@ static void sci_transmit_chars(struct uart_port *port)
 static void sci_receive_chars(struct uart_port *port)
 {
 	struct sci_port *sci_port = to_sci_port(port);
-	struct tty_struct *tty = port->state->port.tty;
+	struct tty_port *tport = &port->state->port;
+	struct tty_struct *tty = tport->tty;
 	int i, count, copied = 0;
 	unsigned short status;
 	unsigned char flag;
@@ -607,7 +608,7 @@ static void sci_receive_chars(struct uart_port *port)
 
 	while (1) {
 		/* Don't copy more bytes than there is room for in the buffer */
-		count = tty_buffer_request_room(tty, sci_rxfill(port));
+		count = tty_buffer_request_room(tport, sci_rxfill(port));
 
 		/* If for any reason we can't copy more data, we're done! */
 		if (count == 0)
@@ -1263,9 +1264,10 @@ static int sci_dma_rx_push(struct sci_port *s, struct tty_struct *tty,
 			   size_t count)
 {
 	struct uart_port *port = &s->port;
+	struct tty_port *tport = &port->state->port;
 	int i, active, room;
 
-	room = tty_buffer_request_room(tty, count);
+	room = tty_buffer_request_room(tport, count);
 
 	if (s->active_rx == s->cookie_rx[0]) {
 		active = 0;
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index f99b0c965f85..ed047d9ab1e2 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -469,7 +469,8 @@ static void qe_uart_int_rx(struct uart_qe_port *qe_port)
 	int i;
 	unsigned char ch, *cp;
 	struct uart_port *port = &qe_port->port;
-	struct tty_struct *tty = port->state->port.tty;
+	struct tty_port *tport = &port->state->port;
+	struct tty_struct *tty = tport->tty;
 	struct qe_bd *bdp;
 	u16 status;
 	unsigned int flg;
@@ -491,7 +492,7 @@ static void qe_uart_int_rx(struct uart_qe_port *qe_port)
 		/* If we don't have enough room in RX buffer for the entire BD,
 		 * then we try later, which will be the next RX interrupt.
 		 */
-		if (tty_buffer_request_room(tty, i) < i) {
+		if (tty_buffer_request_room(tport, i) < i) {
 			dev_dbg(port->dev, "ucc-uart: no room in RX buffer\n");
 			return;
 		}