Staging: speakup: Fix getting port information

Commit f79b0d9c223c ("staging: speakup: Fixed warning <linux/serial.h>
instead of <asm/serial.h>") broke the port information in the speakup
driver: SERIAL_PORT_DFNS only gets defined if asm/serial.h is included,
and no other header includes asm/serial.h.

We here make sure serialio.c does get the arch-specific definition of
SERIAL_PORT_DFNS from asm/serial.h, if any.

Along the way, this makes sure that we do have information for the
requested serial port number (index)

Fixes: f79b0d9c223c ("staging: speakup: Fixed warning <linux/serial.h> instead of <asm/serial.h>")
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: stable <stable@vger.kernel.org> # 3.18
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/speakup/serialio.c b/drivers/staging/speakup/serialio.c
index 3b5835b2812849f0c32055f065ef0be6a0c4d0d0..a5bbb338f275495c18bf6051adf60ee8a3bbcc1d 100644 (file)
--- a/drivers/staging/speakup/serialio.c
+++ b/drivers/staging/speakup/serialio.c
@@ -6,6 +6,11 @@
 #include "spk_priv.h"
 #include "serialio.h"
 
+#include <linux/serial_core.h>
+/* WARNING:  Do not change this to <linux/serial.h> without testing that
+ * SERIAL_PORT_DFNS does get defined to the appropriate value. */
+#include <asm/serial.h>
+
 #ifndef SERIAL_PORT_DFNS
 #define SERIAL_PORT_DFNS
 #endif
@@ -23,9 +28,15 @@ const struct old_serial_port *spk_serial_init(int index)
        int baud = 9600, quot = 0;
        unsigned int cval = 0;
        int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
-       const struct old_serial_port *ser = rs_table + index;
+       const struct old_serial_port *ser;
        int err;
 
+       if (index >= ARRAY_SIZE(rs_table)) {
+               pr_info("no port info for ttyS%d\n", index);
+               return NULL;
+       }
+       ser = rs_table + index;
+
        /*      Divisor, bytesize and parity */
        quot = ser->baud_base / baud;
        cval = cflag & (CSIZE | CSTOPB);