tree 09cd94995a4c67b0fd84f7c81b7f2bb58fac8e50
parent cf0594625083111ae522496dc1c256f7476939c2
author Alan Cox <alan@lxorguk.ukuu.org.uk> 1199804151 +0000
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1199837794 -0800

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>