diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-01-08 14:55:51 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-08 16:16:34 -0800 |
| commit | bf5e5834bffc62b50cd4a201804506eb11ef1af8 (patch) | |
| tree | 09cd94995a4c67b0fd84f7c81b7f2bb58fac8e50 /drivers/char/tty_ioctl.c | |
| parent | cf0594625083111ae522496dc1c256f7476939c2 (diff) | |
pl2303: Fix mode switching regression
Cleaning out all the incorrect 'no change made' checks for termios
settings showed up a problem with the PL2303. The hardware here seems to
lose sync and bits if you tell it to make no changes. This shows up with
a real world application.
To fix this the driver check for meaningful hardware changes is restored
but doing the tests correctly and as a tty layer function so it doesn't
get duplicated wrongly everywhere if other drivers turn out to need it.
Signed-off-by: Alan Cox <alan@redhat.com>
Tested-by: Mirko Parthey <mirko.parthey@informatik.tu-chemnitz.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_ioctl.c')
| -rw-r--r-- | drivers/char/tty_ioctl.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c index e02d59245a1..d4b6d64e858 100644 --- a/drivers/char/tty_ioctl.c +++ b/drivers/char/tty_ioctl.c @@ -365,6 +365,25 @@ void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) EXPORT_SYMBOL(tty_termios_copy_hw); /** + * tty_termios_hw_change - check for setting change + * @a: termios + * @b: termios to compare + * + * Check if any of the bits that affect a dumb device have changed + * between the two termios structures, or a speed change is needed. + */ + +int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) +{ + if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) + return 1; + if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) + return 1; + return 0; +} +EXPORT_SYMBOL(tty_termios_hw_change); + +/** * change_termios - update termios values * @tty: tty to update * @new_termios: desired new value |