linux-kernel - Re: [3/3] gigaset: prune use of tty_buffer_request

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Date:	Mon, 15 Mar 2010 14:48:05 -0000
From:	Karsten Keil <isdn@...ux-pingi.de>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	isdn4linux <isdn4linux@...tserv.isdn4linux.de>,
	Hansjoerg Lipp <hjlipp@....de>,
	i4ldeveloper <i4ldeveloper@...tserv.isdn4linux.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [3/3] gigaset: prune use of tty_buffer_request_room

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@...p.cc>
Acked-by: Karsten Keil <keil@...systems.de>

---
Note to -stable: applies correctly to 2.6.33 with fuzz 2.

 drivers/isdn/gigaset/interface.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index a1bcbc2..f0dc6c9 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -628,7 +628,6 @@ void gigaset_if_receive(struct cardstate *cs,
 	if (tty == NULL)
 		gig_dbg(DEBUG_IF, "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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