Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / drivers / tty / serial / 8250 / 8250_port.c

diff --git a/kernel/drivers/tty/serial/8250/8250_port.c b/kernel/drivers/tty/serial/8250/8250_port.c
index 5568d70..a0b9e85 100644 (file)
--- a/kernel/drivers/tty/serial/8250/8250_port.c
+++ b/kernel/drivers/tty/serial/8250/8250_port.c
@@ -714,22 +714,16 @@ static int size_fifo(struct uart_8250_port *up)
  */
 static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
 {
-       unsigned char old_dll, old_dlm, old_lcr;
-       unsigned int id;
+       unsigned char old_lcr;
+       unsigned int id, old_dl;
 
        old_lcr = serial_in(p, UART_LCR);
        serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
+       old_dl = serial_dl_read(p);
+       serial_dl_write(p, 0);
+       id = serial_dl_read(p);
+       serial_dl_write(p, old_dl);
 
-       old_dll = serial_in(p, UART_DLL);
-       old_dlm = serial_in(p, UART_DLM);
-
-       serial_out(p, UART_DLL, 0);
-       serial_out(p, UART_DLM, 0);
-
-       id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
-
-       serial_out(p, UART_DLL, old_dll);
-       serial_out(p, UART_DLM, old_dlm);
        serial_out(p, UART_LCR, old_lcr);
 
        return id;
@@ -2850,9 +2844,9 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
 
        serial8250_rpm_get(up);
 
-       if (port->sysrq)
+       if (port->sysrq || oops_in_progress)
                locked = 0;
-       else if (oops_in_progress || in_kdb_printk())
+       else if (in_kdb_printk())
                locked = spin_trylock_irqsave(&port->lock, flags);
        else
                spin_lock_irqsave(&port->lock, flags);