Re: [CFT:PATCH] 3/3: Disable OX950 transmitter for flow control

[Russell King <rmk+lkml@arm.linux.org.uk>]

Disable the transmitter whenever we want to prevent characters
being transmitted by flow control.  However, if we run out of
characters to send and want to only disable the TX interrupt,
allow that scenario.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Index: drivers/serial/8250.c
===================================================================
--- d1d56a4a3295f62a01fc06ffc764da474d2aa9b1/drivers/serial/8250.c  (mode:100644)
+++ uncommitted/drivers/serial/8250.c  (mode:100644)
@@ -1007,21 +1007,24 @@
 	up->port.irq = (irq > 0) ? irq : 0;
 }
 
+static inline void __stop_tx(struct uart_8250_port *p)
+{
+	if (p->ier & UART_IER_THRI) {
+		p->ier &= ~UART_IER_THRI;
+		serial_out(p, UART_IER, p->ier);
+	}
+}
+
 static void serial8250_stop_tx(struct uart_port *port, unsigned int tty_stop)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 
-	if (up->ier & UART_IER_THRI) {
-		up->ier &= ~UART_IER_THRI;
-		serial_out(up, UART_IER, up->ier);
-	}
+	__stop_tx(up);
 
 	/*
-	 * We only do this from uart_stop - if we run out of
-	 * characters to send, we don't want to prevent the
-	 * FIFO from emptying.
+	 * We really want to stop the transmitter from sending.
 	 */
-	if (up->port.type == PORT_16C950 && tty_stop) {
+	if (up->port.type == PORT_16C950) {
 		up->acr |= UART_ACR_TXDIS;
 		serial_icr_write(up, UART_ACR, up->acr);
 	}
@@ -1045,10 +1048,11 @@
 				transmit_chars(up);
 		}
 	}
+
 	/*
-	 * We only do this from uart_start
+	 * Re-enable the transmitter if we disabled it.
 	 */
-	if (tty_start && up->port.type == PORT_16C950) {
+	if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
 		up->acr &= ~UART_ACR_TXDIS;
 		serial_icr_write(up, UART_ACR, up->acr);
 	}
@@ -1169,7 +1173,7 @@
 		return;
 	}
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
-		serial8250_stop_tx(&up->port, 0);
+		__stop_tx(up);
 		return;
 	}
 
@@ -1188,7 +1192,7 @@
 	DEBUG_INTR("THRE...");
 
 	if (uart_circ_empty(xmit))
-		serial8250_stop_tx(&up->port, 0);
+		__stop_tx(up);
 }
 
 static _INLINE_ void check_modem_status(struct uart_8250_port *up)