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>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 613c852ee0fe..dc184d4b5638 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -183,6 +183,8 @@ struct tty_struct *alloc_tty_struct(void)
 
 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 @@ void do_SAK(struct tty_struct *tty)
 
 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 @@ void initialize_tty_struct(struct tty_struct *tty,
         tty->ops = driver->ops;
         tty->index = idx;
         tty_line_name(driver, idx, tty->name);
+        tty->dev = tty_get_device(tty);
 }
 
 /**
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 67d64e6efe7a..d94eb86266c4 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -256,6 +256,7 @@ struct tty_operations;
 struct tty_struct {
         int     magic;
         struct kref kref;
+        struct device *dev;
         struct tty_driver *driver;
         const struct tty_operations *ops;
         int index;