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path: root/drivers/char/tty_io.c
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Diffstat (limited to 'drivers/char/tty_io.c')
-rw-r--r--drivers/char/tty_io.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index a3afa0c387c..ea18a129b0b 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1184,6 +1184,7 @@ int tty_init_termios(struct tty_struct *tty)
tty->termios->c_ospeed = tty_termios_baud_rate(tty->termios);
return 0;
}
+EXPORT_SYMBOL_GPL(tty_init_termios);
/**
* tty_driver_install_tty() - install a tty entry in the driver
@@ -1386,10 +1387,14 @@ EXPORT_SYMBOL(tty_shutdown);
* tty_mutex - sometimes only
* takes the file list lock internally when working on the list
* of ttys that the driver keeps.
+ *
+ * This method gets called from a work queue so that the driver private
+ * shutdown ops can sleep (needed for USB at least)
*/
-static void release_one_tty(struct kref *kref)
+static void release_one_tty(struct work_struct *work)
{
- struct tty_struct *tty = container_of(kref, struct tty_struct, kref);
+ struct tty_struct *tty =
+ container_of(work, struct tty_struct, hangup_work);
struct tty_driver *driver = tty->driver;
if (tty->ops->shutdown)
@@ -1407,6 +1412,15 @@ static void release_one_tty(struct kref *kref)
free_tty_struct(tty);
}
+static void queue_release_one_tty(struct kref *kref)
+{
+ struct tty_struct *tty = container_of(kref, struct tty_struct, kref);
+ /* The hangup queue is now free so we can reuse it rather than
+ waste a chunk of memory for each port */
+ INIT_WORK(&tty->hangup_work, release_one_tty);
+ schedule_work(&tty->hangup_work);
+}
+
/**
* tty_kref_put - release a tty kref
* @tty: tty device
@@ -1418,7 +1432,7 @@ static void release_one_tty(struct kref *kref)
void tty_kref_put(struct tty_struct *tty)
{
if (tty)
- kref_put(&tty->kref, release_one_tty);
+ kref_put(&tty->kref, queue_release_one_tty);
}
EXPORT_SYMBOL(tty_kref_put);
@@ -2085,7 +2099,7 @@ static int tioccons(struct file *file)
* the generic functionality existed. This piece of history is preserved
* in the expected tty API of posix OS's.
*
- * Locking: none, the open fle handle ensures it won't go away.
+ * Locking: none, the open file handle ensures it won't go away.
*/
static int fionbio(struct file *file, int __user *p)
@@ -3056,11 +3070,22 @@ void __init console_init(void)
}
}
+static char *tty_devnode(struct device *dev, mode_t *mode)
+{
+ if (!mode)
+ return NULL;
+ if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) ||
+ dev->devt == MKDEV(TTYAUX_MAJOR, 2))
+ *mode = 0666;
+ return NULL;
+}
+
static int __init tty_class_init(void)
{
tty_class = class_create(THIS_MODULE, "tty");
if (IS_ERR(tty_class))
return PTR_ERR(tty_class);
+ tty_class->devnode = tty_devnode;
return 0;
}