tty: Fix up char drivers request_room usage

We can't change them all but quite a few misuse it.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/char/nozomi.c

@@ -853,8 +853,6 @@ static int receive_data(enum port_type index, struct nozomi *dc)
 		goto put;
 	}
 
-	tty_buffer_request_room(tty, size);
-
 	while (size > 0) {
 		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 

drivers/char/serial167.c

@@ -658,8 +658,7 @@ static irqreturn_t cd2401_rx_interrupt(int irq, void *dev_id)
 			info->mon.char_max = char_count;
 		info->mon.char_last = char_count;
 #endif
-		len = tty_buffer_request_room(tty, char_count);
-		while (len--) {
+		while (char_count--) {
 			data = base_addr[CyRDR];
 			tty_insert_flip_char(tty, data, TTY_NORMAL);
 #ifdef CYCLOM_16Y_HACK

drivers/char/specialix.c

@@ -646,8 +646,6 @@ static void sx_receive(struct specialix_board *bp)
 	dprintk(SX_DEBUG_RX, "port: %p: count: %d\n", port, count);
 	port->hits[count > 8 ? 9 : count]++;
 
-	tty_buffer_request_room(tty, count);
-
 	while (count--)
 		tty_insert_flip_char(tty, sx_in(bp, CD186x_RDR), TTY_NORMAL);
 	tty_flip_buffer_push(tty);

drivers/serial/icom.c

@@ -751,7 +751,6 @@ static void recv_interrupt(u16 port_int_reg, struct icom_port *icom_port)
 		trace(icom_port, "FID_STATUS", status);
 		count = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].leLength);
 
-                count = tty_buffer_request_room(tty, count);
 		trace(icom_port, "RCV_COUNT", count);
 
 		trace(icom_port, "REAL_COUNT", count);

drivers/serial/ioc3_serial.c

@@ -1411,8 +1411,7 @@ static int receive_chars(struct uart_port *the_port)
 	read_count = do_read(the_port, ch, MAX_CHARS);
 	if (read_count > 0) {
 		flip = 1;
-		read_room = tty_buffer_request_room(tty, read_count);
-		tty_insert_flip_string(tty, ch, read_room);
+		read_room = tty_insert_flip_string(tty, ch, read_count);
 		the_port->icount.rx += read_count;
 	}
 	spin_unlock_irqrestore(&the_port->lock, pflags);