linux-kernel - [PATCH 15/31] tty: Make vt's have a tty

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Date:	Tue,  1 Jun 2010 22:52:55 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	John Kacur <jkacur@...hat.com>, Alan Cox <alan@...ux.intel.com>
Subject: [PATCH 15/31] tty: Make vt's have a tty_port

From: Alan Cox <alan@...ux.intel.com>

The vt layer isn't safely handling reference counts to tty object on the input
side. Add a tty port structure to the vt layer in order to implement this using
the standard helpers.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
 drivers/char/vt.c              |    2 ++
 include/linux/console_struct.h |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 9f42b1f..8c77ecb 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -772,6 +772,7 @@ int vc_allocate(unsigned int currcons)	/* return 0 on success */
 	    if (!vc)
 		return -ENOMEM;
 	    vc_cons[currcons].d = vc;
+	    tty_port_init(&vc->port);
 	    INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 	    visual_init(vc, currcons, 1);
 	    if (!*vc->vc_uni_pagedir_loc)
@@ -2909,6 +2910,7 @@ static int __init con_init(void)
 	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
 		vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
 		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+		tty_port_init(&vc->port);
 		visual_init(vc, currcons, 1);
 		vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
 		vc_init(vc, vc->vc_rows, vc->vc_cols,
diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h
index 38fe59d..57e83f1 100644
--- a/include/linux/console_struct.h
+++ b/include/linux/console_struct.h
@@ -21,6 +21,8 @@ struct vt_struct;
 #define NPAR 16
 
 struct vc_data {
+	struct tty_port port;			/* Upper level data */
+
 	unsigned short	vc_num;			/* Console number */
 	unsigned int	vc_cols;		/* [#] Console size */
 	unsigned int	vc_rows;
-- 
1.7.0.4

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