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path: root/drivers/char/hvc_console.c
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Diffstat (limited to 'drivers/char/hvc_console.c')
-rw-r--r--drivers/char/hvc_console.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 465185f..ba55bba 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -312,6 +312,7 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
spin_lock_irqsave(&hp->lock, flags);
/* Check and then increment for fast path open. */
if (hp->count++ > 0) {
+ tty_kref_get(tty);
spin_unlock_irqrestore(&hp->lock, flags);
hvc_kick();
return 0;
@@ -319,7 +320,7 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = hp;
- hp->tty = tty;
+ hp->tty = tty_kref_get(tty);
spin_unlock_irqrestore(&hp->lock, flags);
@@ -336,6 +337,7 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
spin_lock_irqsave(&hp->lock, flags);
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
+ tty_kref_put(tty);
tty->driver_data = NULL;
kref_put(&hp->kref, destroy_hvc_struct);
printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
@@ -363,13 +365,18 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
return;
hp = tty->driver_data;
+
spin_lock_irqsave(&hp->lock, flags);
+ tty_kref_get(tty);
if (--hp->count == 0) {
/* We are done with the tty pointer now. */
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
+ /* Put the ref obtained in hvc_open() */
+ tty_kref_put(tty);
+
if (hp->ops->notifier_del)
hp->ops->notifier_del(hp, hp->data);
@@ -389,6 +396,7 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
spin_unlock_irqrestore(&hp->lock, flags);
}
+ tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
}
@@ -424,10 +432,11 @@ static void hvc_hangup(struct tty_struct *tty)
spin_unlock_irqrestore(&hp->lock, flags);
if (hp->ops->notifier_hangup)
- hp->ops->notifier_hangup(hp, hp->data);
+ hp->ops->notifier_hangup(hp, hp->data);
while(temp_open_count) {
--temp_open_count;
+ tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
}
}
@@ -592,7 +601,7 @@ int hvc_poll(struct hvc_struct *hp)
}
/* No tty attached, just skip */
- tty = hp->tty;
+ tty = tty_kref_get(hp->tty);
if (tty == NULL)
goto bail;
@@ -672,6 +681,8 @@ int hvc_poll(struct hvc_struct *hp)
tty_flip_buffer_push(tty);
}
+ if (tty)
+ tty_kref_put(tty);
return poll_mask;
}
@@ -807,7 +818,7 @@ int hvc_remove(struct hvc_struct *hp)
struct tty_struct *tty;
spin_lock_irqsave(&hp->lock, flags);
- tty = hp->tty;
+ tty = tty_kref_get(hp->tty);
if (hp->index < MAX_NR_HVC_CONSOLES)
vtermnos[hp->index] = -1;
@@ -819,18 +830,18 @@ int hvc_remove(struct hvc_struct *hp)
/*
* We 'put' the instance that was grabbed when the kref instance
* was initialized using kref_init(). Let the last holder of this
- * kref cause it to be removed, which will probably be the tty_hangup
+ * kref cause it to be removed, which will probably be the tty_vhangup
* below.
*/
kref_put(&hp->kref, destroy_hvc_struct);
/*
- * This function call will auto chain call hvc_hangup. The tty should
- * always be valid at this time unless a simultaneous tty close already
- * cleaned up the hvc_struct.
+ * This function call will auto chain call hvc_hangup.
*/
- if (tty)
- tty_hangup(tty);
+ if (tty) {
+ tty_vhangup(tty);
+ tty_kref_put(tty);
+ }
return 0;
}
EXPORT_SYMBOL_GPL(hvc_remove);
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