[SUNSAB]: Fix several bugs.

	* don't register irq until ->startup() (and release in ->shutdown()).
That avoids oopsen with the current tree when interrupt comes before we'd
set up the data structures for ttyb.
	* handle console=ttyS... even when OBP talks to screen/keyboard
	* register irq handler for each port, let kernel/irq/handle.c
call it for both if needed.  Kills code duplication in sunsab_interrupt().
BTW, there'd been bitrot in it - ttya handling had stopped calling
check_status() on BRK (correctly), ttyb copy of that code had kept the
bogus call in that case.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/serial/sunsab.c

@@ -58,6 +58,7 @@ struct uart_sunsab_port {
 	unsigned char			interrupt_mask1;/* ISR1 masking		*/
 	unsigned char			pvr_dtr_bit;	/* Which PVR bit is DTR */
 	unsigned char			pvr_dsr_bit;	/* Which PVR bit is DSR */
+	unsigned int			gis_shift;
 	int				type;		/* SAB82532 version	*/
 
 	/* Setting configuration bits while the transmitter is active
@@ -305,13 +306,15 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 	struct tty_struct *tty;
 	union sab82532_irq_status status;
 	unsigned long flags;
+	unsigned char gis;
 
 	spin_lock_irqsave(&up->port.lock, flags);
 
 	status.stat = 0;
-	if (readb(&up->regs->r.gis) & SAB82532_GIS_ISA0)
+	gis = readb(&up->regs->r.gis) >> up->gis_shift;
+	if (gis & 1)
 		status.sreg.isr0 = readb(&up->regs->r.isr0);
-	if (readb(&up->regs->r.gis) & SAB82532_GIS_ISA1)
+	if (gis & 2)
 		status.sreg.isr1 = readb(&up->regs->r.isr1);
 
 	tty = NULL;
@@ -327,35 +330,6 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 			transmit_chars(up, &status);
 	}
 
-	spin_unlock(&up->port.lock);
-
-	if (tty)
-		tty_flip_buffer_push(tty);
-
-	up++;
-
-	spin_lock(&up->port.lock);
-
-	status.stat = 0;
-	if (readb(&up->regs->r.gis) & SAB82532_GIS_ISB0)
-		status.sreg.isr0 = readb(&up->regs->r.isr0);
-	if (readb(&up->regs->r.gis) & SAB82532_GIS_ISB1)
-		status.sreg.isr1 = readb(&up->regs->r.isr1);
-
-	tty = NULL;
-	if (status.stat) {
-		if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
-					 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
-		    (status.sreg.isr1 & SAB82532_ISR1_BRK))
-
-			tty = receive_chars(up, &status);
-		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
-		    (status.sreg.isr1 & (SAB82532_ISR1_BRK | SAB82532_ISR1_CSC)))
-			check_status(up, &status);
-		if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
-			transmit_chars(up, &status);
-	}
-
 	spin_unlock_irqrestore(&up->port.lock, flags);
 
 	if (tty)
@@ -539,6 +513,10 @@ static int sunsab_startup(struct uart_port *port)
 	struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 	unsigned long flags;
 	unsigned char tmp;
+	int err = request_irq(up->port.irq, sunsab_interrupt,
+			      IRQF_SHARED, "sab", up);
+	if (err)
+		return err;
 
 	spin_lock_irqsave(&up->port.lock, flags);
 
@@ -641,6 +619,7 @@ static void sunsab_shutdown(struct uart_port *port)
 #endif
 
 	spin_unlock_irqrestore(&up->port.lock, flags);
+	free_irq(up->port.irq, up);
 }
 
 /*
@@ -1008,9 +987,11 @@ static int __devinit sunsab_init_one(struct uart_sunsab_port *up,
 	if ((up->port.line & 0x1) == 0) {
 		up->pvr_dsr_bit = (1 << 0);
 		up->pvr_dtr_bit = (1 << 1);
+		up->gis_shift = 2;
 	} else {
 		up->pvr_dsr_bit = (1 << 3);
 		up->pvr_dtr_bit = (1 << 2);
+		up->gis_shift = 0;
 	}
 	up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
 	writeb(up->cached_pvr, &up->regs->w.pvr);
@@ -1023,19 +1004,6 @@ static int __devinit sunsab_init_one(struct uart_sunsab_port *up,
 	up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
 	up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
 
-	if (!(up->port.line & 0x01)) {
-		int err;
-
-		err = request_irq(up->port.irq, sunsab_interrupt,
-				  IRQF_SHARED, "sab", up);
-		if (err) {
-			of_iounmap(&op->resource[0],
-				   up->port.membase,
-				   sizeof(union sab82532_async_regs));
-			return err;
-		}
-	}
-
 	return 0;
 }
 
@@ -1051,52 +1019,60 @@ static int __devinit sab_probe(struct of_device *op, const struct of_device_id *
 			      0,
 			      (inst * 2) + 0);
 	if (err)
-		return err;
+		goto out;
 
 	err = sunsab_init_one(&up[1], op,
 			      sizeof(union sab82532_async_regs),
 			      (inst * 2) + 1);
-	if (err) {
-		of_iounmap(&op->resource[0],
-			   up[0].port.membase,
-			   sizeof(union sab82532_async_regs));
-		free_irq(up[0].port.irq, &up[0]);
-		return err;
-	}
+	if (err)
+		goto out1;
 
 	sunserial_console_match(SUNSAB_CONSOLE(), op->node,
 				&sunsab_reg, up[0].port.line);
-	uart_add_one_port(&sunsab_reg, &up[0].port);
 
 	sunserial_console_match(SUNSAB_CONSOLE(), op->node,
 				&sunsab_reg, up[1].port.line);
-	uart_add_one_port(&sunsab_reg, &up[1].port);
+
+	err = uart_add_one_port(&sunsab_reg, &up[0].port);
+	if (err)
+		goto out2;
+
+	err = uart_add_one_port(&sunsab_reg, &up[1].port);
+	if (err)
+		goto out3;
 
 	dev_set_drvdata(&op->dev, &up[0]);
 
 	inst++;
 
 	return 0;
-}
 
-static void __devexit sab_remove_one(struct uart_sunsab_port *up)
-{
-	struct of_device *op = to_of_device(up->port.dev);
-
-	uart_remove_one_port(&sunsab_reg, &up->port);
-	if (!(up->port.line & 1))
-		free_irq(up->port.irq, up);
+out3:
+	uart_remove_one_port(&sunsab_reg, &up[0].port);
+out2:
+	of_iounmap(&op->resource[0],
+		   up[1].port.membase,
+		   sizeof(union sab82532_async_regs));
+out1:
 	of_iounmap(&op->resource[0],
-		   up->port.membase,
+		   up[0].port.membase,
 		   sizeof(union sab82532_async_regs));
+out:
+	return err;
 }
 
 static int __devexit sab_remove(struct of_device *op)
 {
 	struct uart_sunsab_port *up = dev_get_drvdata(&op->dev);
 
-	sab_remove_one(&up[0]);
-	sab_remove_one(&up[1]);
+	uart_remove_one_port(&sunsab_reg, &up[1].port);
+	uart_remove_one_port(&sunsab_reg, &up[0].port);
+	of_iounmap(&op->resource[0],
+		   up[1].port.membase,
+		   sizeof(union sab82532_async_regs));
+	of_iounmap(&op->resource[0],
+		   up[0].port.membase,
+		   sizeof(union sab82532_async_regs));
 
 	dev_set_drvdata(&op->dev, NULL);
 
@@ -1143,6 +1119,7 @@ static int __init sunsab_init(void)
 
 		sunsab_reg.minor = sunserial_current_minor;
 		sunsab_reg.nr = num_channels;
+		sunsab_reg.cons = SUNSAB_CONSOLE();
 
 		err = uart_register_driver(&sunsab_reg);
 		if (err) {