sunsab: Fix detection of BREAK on sunsab serial console
authorChristopher Alexander Tobias Schulze <cat.schulze@alice-dsl.net>
Sun, 3 Aug 2014 14:01:53 +0000 (16:01 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 5 Aug 2014 00:01:49 +0000 (17:01 -0700)
Fix detection of BREAK on sunsab serial console: BREAK detection was only
performed when there were also serial characters received simultaneously.
To handle all BREAKs correctly, the check for BREAK and the corresponding
call to uart_handle_break() must also be done if count == 0, therefore
duplicate this code fragment and pull it out of the loop over the received
characters.

Patch applies to 3.16-rc6.

Signed-off-by: Christopher Alexander Tobias Schulze <cat.schulze@alice-dsl.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/tty/serial/sunsab.c

index 2f57df9..a1e09c0 100644 (file)
@@ -157,6 +157,15 @@ receive_chars(struct uart_sunsab_port *up,
            (up->port.line == up->port.cons->index))
                saw_console_brk = 1;
 
+       if (count == 0) {
+               if (unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
+                       stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
+                                            SAB82532_ISR0_FERR);
+                       up->port.icount.brk++;
+                       uart_handle_break(&up->port);
+               }
+       }
+
        for (i = 0; i < count; i++) {
                unsigned char ch = buf[i], flag;