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Subject[PATCH] tty: add missing const to termios hw-change helper
Add missing const qualifiers to the termios hw-change helper parameters,
which is used by few USB serial drivers. This specifically allows the
pl2303 driver to use const arguments in one of its helper as well.

Cc: Greg Kroah-Hartman <>
Cc: Jiri Slaby <>
Signed-off-by: Johan Hovold <>

Greg, are you fine with me taking this one through my tree, or do prefer
I split out the pl2303 bits?

Note that this helper is only used by a few USB serial drivers and that
the pl2303 bits depend on a new patch targeted for -next.


drivers/tty/tty_ioctl.c | 2 +-
drivers/usb/serial/pl2303.c | 2 +-
include/linux/tty.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index d9b561d89432..d99fec44036c 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -290,7 +290,7 @@ EXPORT_SYMBOL(tty_termios_copy_hw);
* between the two termios structures, or a speed change is needed.

-int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
+int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b)
if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
return 1;
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index ac231cdf48a6..5d1a1931967e 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -533,7 +533,7 @@ static int pl2303_set_line_request(struct usb_serial_port *port,
return 0;

-static bool pl2303_termios_change(struct ktermios *a, struct ktermios *b)
+static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
bool ixon_change;

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1dd587ba6d88..955cd0c93d84 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -527,7 +527,7 @@ static inline speed_t tty_get_baud_rate(struct tty_struct *tty)

extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
-extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
+extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);

extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
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