[SUNSAB]: Fix serial break handling.

We forget to check the BRK condition in
the interrupt status register when deciding
to call receive_chars() or not, which is where
BRK handling occurs.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/serial/sunsab.c

@@ -143,6 +143,11 @@ receive_chars(struct uart_sunsab_port *up,
 		writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr);
 	}
 
+	/* Count may be zero for BRK, so we check for it here */
+	if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
+	    (up->port.line == up->port.cons->index))
+		saw_console_brk = 1;
+
 	for (i = 0; i < count; i++) {
 		unsigned char ch = buf[i];
 
@@ -172,8 +177,6 @@ receive_chars(struct uart_sunsab_port *up,
 				stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
 						     SAB82532_ISR0_FERR);
 				up->port.icount.brk++;
-				if (up->port.line == up->port.cons->index)
-					saw_console_brk = 1;
 				/*
 				 * We do the SysRQ and SAK checking
 				 * here because otherwise the break
@@ -325,8 +328,9 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	tty = NULL;
 	if (status.stat) {
-		if (status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
-					SAB82532_ISR0_RFO | SAB82532_ISR0_RPF))
+		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, regs);
 		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_CSC))
@@ -352,8 +356,10 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	tty = NULL;
 	if (status.stat) {
-		if (status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
-					SAB82532_ISR0_RFO | SAB82532_ISR0_RPF))
+		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, regs);
 		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 		    (status.sreg.isr1 & (SAB82532_ISR1_BRK | SAB82532_ISR1_CSC)))