[PATCH] use callbacks to access UART_DLL/UART_DLM

[Sebastian Frias]

---
resending as plain-text
---
 drivers/tty/serial/8250/8250_core.c |   17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_core.c 
b/drivers/tty/serial/8250/8250_core.c
index 2c46a21..9ca863c 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -791,22 +791,19 @@ 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 char old_lcr;
     unsigned int id;
+    unsigned int old_dl;

     old_lcr = serial_in(p, UART_LCR);
-    serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
-
-    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);
+    serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);

-    id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
+    old_dl = serial_dl_read(p);
+    serial_dl_write(p, 0);
+    id = serial_dl_read(p);
+    serial_dl_write(p, old_dl);

-    serial_out(p, UART_DLL, old_dll);
-    serial_out(p, UART_DLM, old_dlm);
     serial_out(p, UART_LCR, old_lcr);

     return id;
--
1.7.10.4

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