serial: sh-sci: Tidy up fifo overrun error handling.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

drivers/serial/sh-sci.c

@@ -625,6 +625,27 @@ static inline int sci_handle_errors(struct uart_port *port)
 	return copied;
 }
 
+static inline int sci_handle_fifo_overrun(struct uart_port *port)
+{
+	struct tty_struct *tty = port->info->port.tty;
+	int copied = 0;
+
+	if (port->type != PORT_SCIF)
+		return 0;
+
+	if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
+		sci_out(port, SCLSR, 0);
+
+		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+		tty_flip_buffer_push(tty);
+
+		dev_notice(port->dev, "overrun error\n");
+		copied++;
+	}
+
+	return copied;
+}
+
 static inline int sci_handle_breaks(struct uart_port *port)
 {
 	int copied = 0;
@@ -647,20 +668,11 @@ static inline int sci_handle_breaks(struct uart_port *port)
 		dev_dbg(port->dev, "BREAK detected\n");
 	}
 
-#if defined(SCIF_ORER)
-	/* XXX: Handle SCIF overrun error */
-	if (port->type != PORT_SCI && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
-		sci_out(port, SCLSR, 0);
-		if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
-			copied++;
-			dev_notice(port->dev, "overrun error\n");
-		}
-	}
-#endif
-
 	if (copied)
 		tty_flip_buffer_push(tty);
 
+	copied += sci_handle_fifo_overrun(port);
+
 	return copied;
 }
 
@@ -698,16 +710,7 @@ static irqreturn_t sci_er_interrupt(int irq, void *ptr)
 			sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 		}
 	} else {
-#if defined(SCIF_ORER)
-		if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
-			struct tty_struct *tty = port->info->port.tty;
-
-			sci_out(port, SCLSR, 0);
-			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
-			tty_flip_buffer_push(tty);
-			dev_notice(port->dev, "overrun error\n");
-		}
-#endif
+		sci_handle_fifo_overrun(port);
 		sci_rx_interrupt(irq, ptr);
 	}
 

drivers/serial/sh-sci.h

@@ -232,6 +232,10 @@
 # define SCIF_TXROOM_MAX 16
 #endif
 
+#ifndef SCIF_ORER
+#define SCIF_ORER	0x0000
+#endif
+
 #define SCxSR_TEND(port)	(((port)->type == PORT_SCI) ? SCI_TEND   : SCIF_TEND)
 #define SCxSR_ERRORS(port)	(((port)->type == PORT_SCI) ? SCI_ERRORS : SCIF_ERRORS)
 #define SCxSR_RDxF(port)	(((port)->type == PORT_SCI) ? SCI_RDRF   : SCIF_RDF)
@@ -239,12 +243,7 @@
 #define SCxSR_FER(port)		(((port)->type == PORT_SCI) ? SCI_FER    : SCIF_FER)
 #define SCxSR_PER(port)		(((port)->type == PORT_SCI) ? SCI_PER    : SCIF_PER)
 #define SCxSR_BRK(port)		(((port)->type == PORT_SCI) ? 0x00       : SCIF_BRK)
-
-#if defined(CONFIG_CPU_SUBTYPE_SH7705)
-# define SCxSR_ORER(port)	(((port)->type == PORT_SCI) ? SCI_ORER : SCIF_ORER)
-#else
-# define SCxSR_ORER(port)	(((port)->type == PORT_SCI) ? SCI_ORER : 0x0000)
-#endif
+#define SCxSR_ORER(port)	(((port)->type == PORT_SCI) ? SCI_ORER	 : SCIF_ORER)
 
 #if defined(CONFIG_CPU_SUBTYPE_SH7705) || \
     defined(CONFIG_CPU_SUBTYPE_SH7720) || \