tty: add tty_struct->dev pointer to corresponding device instance
Some device drivers (mostly tty line disciplines) would like to have way
know a struct device instance corresponding to passed tty_struct. Add
a struct device pointer to struct tty_struct and populate it during
initialize_tty_struct().
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 613c852..dc184d4 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -183,6 +183,8 @@
void free_tty_struct(struct tty_struct *tty)
{
+ if (tty->dev)
+ put_device(tty->dev);
kfree(tty->write_buf);
tty_buffer_free_all(tty);
kfree(tty);
@@ -2783,6 +2785,20 @@
EXPORT_SYMBOL(do_SAK);
+static int dev_match_devt(struct device *dev, void *data)
+{
+ dev_t *devt = data;
+ return dev->devt == *devt;
+}
+
+/* Must put_device() after it's unused! */
+static struct device *tty_get_device(struct tty_struct *tty)
+{
+ dev_t devt = tty_devnum(tty);
+ return class_find_device(tty_class, NULL, &devt, dev_match_devt);
+}
+
+
/**
* initialize_tty_struct
* @tty: tty to initialize
@@ -2823,6 +2839,7 @@
tty->ops = driver->ops;
tty->index = idx;
tty_line_name(driver, idx, tty->name);
+ tty->dev = tty_get_device(tty);
}
/**