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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/usb
parentcf0594625083111ae522496dc1c256f7476939c2 (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/usb')
-rw-r--r--drivers/usb/serial/pl2303.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index cf8add91de0..0da1df9c79b 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -483,6 +483,13 @@ static void pl2303_set_termios(struct usb_serial_port *port,
}
spin_unlock_irqrestore(&priv->lock, flags);
+ /* The PL2303 is reported to lose bytes if you change
+ serial settings even to the same values as before. Thus
+ we actually need to filter in this specific case */
+
+ if (!tty_termios_hw_change(port->tty->termios, old_termios))
+ return;
+
cflag = port->tty->termios->c_cflag;
buf = kzalloc(7, GFP_KERNEL);