[PATCH] const struct tty_operations

As part of an SMP cleanliness pass over UML, I consted a bunch of
structures in order to not have to document their locking.  One of these
structures was a struct tty_operations.  In order to const it in UML
without introducing compiler complaints, the declaration of
tty_set_operations needs to be changed, and then all of its callers need to
be fixed.

This patch declares all struct tty_operations in the tree as const.  In all
cases, they are static and used only as input to tty_set_operations.  As an
extra check, I ran an i386 allyesconfig build which produced no extra
warnings.

53 drivers are affected.  I checked the history of a bunch of them, and in
most cases, there have been only a handful of maintenance changes in the
last six months.  serial_core.c was the busiest one that I looked at.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 3 insertions, 3 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index ca90326f2f5c..71288295df2f 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1120,7 +1120,7 @@ static struct usb_driver acm_driver = {
  * TTY driver structures.
  */
 
-static struct tty_operations acm_ops = {
+static const struct tty_operations acm_ops = {
         .open =                 acm_tty_open,
         .close =                acm_tty_close,
         .write =                acm_tty_write,
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index b893e3118e1b..489a85e58bca 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -271,7 +271,7 @@ static unsigned int use_acm = GS_DEFAULT_USE_ACM;
 
 
 /* tty driver struct */
-static struct tty_operations gs_tty_ops = {
+static const struct tty_operations gs_tty_ops = {
         .open =                 gs_open,
         .close =                gs_close,
         .write =                gs_write,
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 0222d92842b8..8006e51c34bb 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1015,7 +1015,7 @@ void usb_serial_disconnect(struct usb_interface *interface)
         dev_info(dev, "device disconnected\n");
 }
 
-static struct tty_operations serial_ops = {
+static const struct tty_operations serial_ops = {
         .open =                 serial_open,
         .close =                serial_close,
         .write =                serial_write,