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From: Greg KH on 30 Mar 2010 19:30
2.6.33-stable review patch. If anyone has any objections, please let us know.

------------------

From: Tilman Schmidt <tilman(a)imap.cc>

commit 873a69a358a6b393fd8d9d92e193ec8895cac4d7 upstream.

Calling tty_buffer_request_room() before tty_insert_flip_string()
is unnecessary, costs CPU and for big buffers can mess up the
multi-page allocation avoidance.

Signed-off-by: Tilman Schmidt <tilman(a)imap.cc>
Acked-by: Karsten Keil <keil(a)b1-systems.de>
CC: Alan Cox <alan(a)lxorguk.ukuu.org.uk>
Signed-off-by: David S. Miller <davem(a)davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/isdn/gigaset/interface.c | 1 -
1 file changed, 1 deletion(-)

--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -632,7 +632,6 @@ void gigaset_if_receive(struct cardstate
if (tty == NULL)
gig_dbg(DEBUG_ANY, "receive on closed device");
else {
- tty_buffer_request_room(tty, len);
tty_insert_flip_string(tty, buffer, len);
tty_flip_buffer_push(tty);
}


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