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serial: Optimization: check for presence of UPF_EXAR_EFR flag before serial_in

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Optimization: check for presence of UPF_EXAR_EFR flag before serial_in

Signed-off-by: Matt Schulte <matts@commtech-fastcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Schulte 2012-11-20 11:23:56 -06:00 committed by Greg Kroah-Hartman
parent d02f815553
commit b7a7e14f65
1 changed files with 3 additions and 3 deletions
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6
drivers/tty/serial/8250/8250.c
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@ -911,9 +911,9 @@ static void autoconfig_16550a(struct uart_8250_port *up)
* found at offset 0x09. Instead check the Deice ID (DVID)
* register for a 2, 4 or 8 port UART.
*/
status1 = serial_in(up, UART_EXAR_DVID);
if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) {
if (up->port.flags & UPF_EXAR_EFR) {
if (up->port.flags & UPF_EXAR_EFR) {
status1 = serial_in(up, UART_EXAR_DVID);
if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) {
DEBUG_AUTOCONF("Exar XR17V35x ");
up->port.type = PORT_XR17V35X;
up->capabilities |= UART_CAP_AFE | UART_CAP_EFR |