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gigaset: prune use of tty_buffer_request_room

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commit 873a69a358 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@imap.cc>
Acked-by: Karsten Keil <keil@b1-systems.de>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tilman Schmidt 2010-03-14 12:58:05 +00:00 committed by Greg Kroah-Hartman
parent 4ea1533c2b
commit bddf110a16
1 changed files with 0 additions and 1 deletions
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drivers/isdn/gigaset/interface.c
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@ -635,7 +635,6 @@ void gigaset_if_receive(struct cardstate *cs,
if ((tty = cs->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);
}