hvc_console: Add a hangup notifier for backends

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@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index bf70450..5c9750e 100644 (file)
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -418,8 +418,8 @@ static void hvc_hangup(struct tty_struct *tty)
 
        spin_unlock_irqrestore(&hp->lock, flags);
 
-       if (hp->ops->notifier_del)
-                       hp->ops->notifier_del(hp, hp->data);
+       if (hp->ops->notifier_hangup)
+                       hp->ops->notifier_hangup(hp, hp->data);
 
        while(temp_open_count) {
                --temp_open_count;

diff --git a/drivers/char/hvc_console.h b/drivers/char/hvc_console.h
index 9790201..ec0e9bb 100644 (file)
--- a/drivers/char/hvc_console.h
+++ b/drivers/char/hvc_console.h
@@ -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)

diff --git a/drivers/char/hvc_irq.c b/drivers/char/hvc_irq.c
index 73a59cd..d09e568 100644 (file)
--- a/drivers/char/hvc_irq.c
+++ b/drivers/char/hvc_irq.c
@@ -42,3 +42,8 @@ void notifier_del_irq(struct hvc_struct *hp, int irq)
        free_irq(irq, hp);
        hp->irq_requested = 0;
 }
+
+void notifier_hangup_irq(struct hvc_struct *hp, int irq)
+{
+       notifier_del_irq(hp, irq);
+}

diff --git a/drivers/char/hvc_iseries.c b/drivers/char/hvc_iseries.c
index b71c610..b74a2f8 100644 (file)
--- a/drivers/char/hvc_iseries.c
+++ b/drivers/char/hvc_iseries.c
@@ -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,

diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 93f3840..019e0b5 100644 (file)
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -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,

diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
index 538ceea..eba999f 100644 (file)
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -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)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index d0f4eb6..3fb0d2c 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -198,6 +198,7 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
        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