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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-01-08 14:55:51 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-08 16:16:34 -0800
commitbf5e5834bffc62b50cd4a201804506eb11ef1af8 (patch)
tree09cd94995a4c67b0fd84f7c81b7f2bb58fac8e50 /drivers/char/tty_ioctl.c
parentcf0594625083111ae522496dc1c256f7476939c2 (diff)
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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.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index e02d59245a17..d4b6d64e858b 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