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serial: sunsab: Don't enable tx if tx stopped 

The serial core may call the UART driver's start_tx() even if
tx is stopped; the UART driver must verify tx should be enabled
before transmitting.

Reported-by: Sam Ravnborg <sam@ravnborg.org>
cc: David S. Miller <davem@davemloft.net>
cc: <sparclinux@vger.kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Peter Hurley 2014-09-02 17:39:17 -04:00 committed by Greg Kroah-Hartman
parent 16f404e366
commit 98f8b83d6a
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/sunsab.c
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@ -436,7 +436,7 @@ static void sunsab_start_tx(struct uart_port *port)
struct circ_buf *xmit = &up->port.state->xmit;
int i;
if (uart_circ_empty(xmit))
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return;
up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);