linux-kernel - [PATCH 1/4] fix kfifo miss use of nozami.c

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Message-Id: <1271624718-8256-2-git-send-email-stefani@seibold.net>
Date:	Sun, 18 Apr 2010 23:05:15 +0200
From:	stefani@...bold.net
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	andi@...stfloor.org, gregkh@...e.de, alan@...rguk.ukuu.org.uk,
	tytso@....edu, iws@...o.caltech.edu
Cc:	stefani@...bold.net
Subject: [PATCH 1/4] fix kfifo miss use of nozami.c

From: Stefani Seibold <stefani@...bold.net>

User of the kernel fifo should never bypass the API and directly access
the fifo structure. Otherwise it will be very hard to maintain the API.

Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 drivers/char/nozomi.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c
index a663800..d578449 100644
--- a/drivers/char/nozomi.c
+++ b/drivers/char/nozomi.c
@@ -1741,8 +1741,7 @@ static int ntty_write_room(struct tty_struct *tty)
 	if (dc) {
 		mutex_lock(&port->tty_sem);
 		if (port->port.count)
-			room = port->fifo_ul.size -
-					kfifo_len(&port->fifo_ul);
+			room = kfifo_avail(&port->fifo_ul);
 		mutex_unlock(&port->tty_sem);
 	}
 	return room;
-- 
1.7.0.4

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