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Subject[PATCH 3.19.y-ckt 37/47] Staging: speakup: Fix getting port information
Date
3.19.8-ckt15 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Samuel Thibault <samuel.thibault@ens-lyon.org>

commit 327b882d3bcc1fba82dbd39b5cf5a838c81218e2 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/staging/speakup/serialio.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/speakup/serialio.c b/drivers/staging/speakup/serialio.c
index 1d9d51b..f41a7da 100644
--- 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);
--
1.9.1
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