1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index f2dfec82faf8..7f50999eebc2 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -1819,6 +1819,8 @@ static void serial8250_backup_timeout(unsigned long data)
         unsigned int iir, ier = 0, lsr;
         unsigned long flags;
 
+        spin_lock_irqsave(&up->port.lock, flags);
+
         /*
          * Must disable interrupts or else we risk racing with the interrupt
          * based handler.
@@ -1836,10 +1838,8 @@ static void serial8250_backup_timeout(unsigned long data)
          * the "Diva" UART used on the management processor on many HP
          * ia64 and parisc boxes.
          */
-        spin_lock_irqsave(&up->port.lock, flags);
         lsr = serial_in(up, UART_LSR);
         up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
-        spin_unlock_irqrestore(&up->port.lock, flags);
         if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
             (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
             (lsr & UART_LSR_THRE)) {
@@ -1848,11 +1848,13 @@ static void serial8250_backup_timeout(unsigned long data)
         }
 
         if (!(iir & UART_IIR_NO_INT))
-                serial8250_handle_port(up);
+                transmit_chars(up);
 
         if (is_real_interrupt(up->port.irq))
                 serial_out(up, UART_IER, ier);
 
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
         /* Standard timer interval plus 0.2s to keep the port running */
         mod_timer(&up->timer,
                 jiffies + uart_poll_timeout(&up->port) + HZ / 5);