[RFC PATCH 1/5] hvc_console: Adding hangup notifier

[Hendrik Brueckner]

From: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>

I have added a hangup notifier that can be used by hvc console
backends to handle a tty hangup. The default irq hangup notifier
calls the notifier_del_irq() for compatibility.

Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
---
 drivers/char/hvc_console.c    |    4 ++--
 drivers/char/hvc_console.h    |    4 +++-
 drivers/char/hvc_irq.c        |    5 +++++
 drivers/char/hvc_iseries.c    |    1 +
 drivers/char/hvc_vio.c        |    1 +
 drivers/char/hvc_xen.c        |    1 +
 drivers/char/virtio_console.c |    1 +
 7 files changed, 14 insertions(+), 3 deletions(-)

--- a/drivers/char/hvc_console.c	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_console.c	2008-10-09 10:30:13.000000000 +0200
@@ -416,8 +416,8 @@ static void hvc_hangup(struct tty_struct
 	hp->n_outbuf = 0;
 	hp->tty = NULL;
 
-	if (hp->ops->notifier_del)
-			hp->ops->notifier_del(hp, hp->data);
+	if (hp->ops->notifier_hangup)
+			hp->ops->notifier_hangup(hp, hp->data);
 
 	spin_unlock_irqrestore(&hp->lock, flags);
 
--- a/drivers/char/hvc_console.h	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_console.h	2008-10-09 10:30:13.000000000 +0200
@@ -65,9 +65,10 @@ struct hv_ops {
 	int (*get_chars)(uint32_t vtermno, char *buf, int count);
 	int (*put_chars)(uint32_t vtermno, const char *buf, int count);
 
-	/* Callbacks for notification. Called in open and close */
+	/* Callbacks for notification. Called in open, close and hangup */
 	int (*notifier_add)(struct hvc_struct *hp, int irq);
 	void (*notifier_del)(struct hvc_struct *hp, int irq);
+	void (*notifier_hangup)(struct hvc_struct *hp, int irq);
 };
 
 /* Register a vterm and a slot index for use as a console (console_init) */
@@ -86,6 +87,7 @@ void hvc_kick(void);
 /* default notifier for irq based notification */
 extern int notifier_add_irq(struct hvc_struct *hp, int data);
 extern void notifier_del_irq(struct hvc_struct *hp, int data);
+extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
 
 
 #if defined(CONFIG_XMON) && defined(CONFIG_SMP)
--- a/drivers/char/hvc_irq.c	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_irq.c	2008-10-09 10:30:13.000000000 +0200
@@ -42,3 +42,8 @@ void notifier_del_irq(struct hvc_struct 
 	free_irq(irq, hp);
 	hp->irq_requested = 0;
 }
+
+void notifier_hangup_irq(struct hvc_struct *hp, int irq)
+{
+	notifier_del_irq(hp, irq);
+}
--- a/drivers/char/hvc_iseries.c	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_iseries.c	2008-10-09 10:30:13.000000000 +0200
@@ -202,6 +202,7 @@ static struct hv_ops hvc_get_put_ops = {
 	.put_chars = put_chars,
 	.notifier_add = notifier_add_irq,
 	.notifier_del = notifier_del_irq,
+	.notifier_hangup = notifier_hangup_irq,
 };
 
 static int __devinit hvc_vio_probe(struct vio_dev *vdev,
--- a/drivers/char/hvc_xen.c	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_xen.c	2008-10-09 10:30:13.000000000 +0200
@@ -102,6 +102,7 @@ static struct hv_ops hvc_ops = {
 	.put_chars = write_console,
 	.notifier_add = notifier_add_irq,
 	.notifier_del = notifier_del_irq,
+	.notifier_hangup = notifier_hangup_irq,
 };
 
 static int __init xen_init(void)
--- a/drivers/char/hvc_vio.c	2008-10-08 16:08:40.000000000 +0200
+++ b/drivers/char/hvc_vio.c	2008-10-09 10:30:13.000000000 +0200
@@ -82,6 +82,7 @@ static struct hv_ops hvc_get_put_ops = {
 	.put_chars = hvc_put_chars,
 	.notifier_add = notifier_add_irq,
 	.notifier_del = notifier_del_irq,
+	.notifier_hangup = notifier_hangup_irq,
 };
 
 static int __devinit hvc_vio_probe(struct vio_dev *vdev,
--- a/drivers/char/virtio_console.c	2008-10-09 10:29:41.000000000 +0200
+++ b/drivers/char/virtio_console.c	2008-10-09 10:30:23.000000000 +0200
@@ -198,6 +198,7 @@ static int __devinit virtcons_probe(stru
 	virtio_cons.put_chars = put_chars;
 	virtio_cons.notifier_add = notifier_add_vio;
 	virtio_cons.notifier_del = notifier_del_vio;
+	virtio_cons.notifier_hangup = notifier_del_vio;
 
 	/* The first argument of hvc_alloc() is the virtual console number, so
 	 * we use zero.  The second argument is the parameter for the

-- 
Hendrik Brueckner
D/3303 Linux on System z Development
Tel: +49 7031 16-1073
Fax: +49 7031 16-3456
eMail: brueckner@xxxxxxxxxxxxxxxxxx
IBM Deutschland Research & Development GmbH, Schoenaicher Str. 220, 71032 Boeblingen

IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschaeftsfuehrung: Erich Baier
Sitz der Gesellschaft: Boeblingen
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