serial: Optimization: check for presence of UPF_EXAR_EFR flag before serial_in
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>
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 3624df6..39d9707 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -911,9 +911,9 @@
* 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 |