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authorDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2010-08-09 18:22:49 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:19:56 -0700
commit30004ac9c090dcdcca99556b4587b3bad828731a (patch)
treebf8931378abc6912d7e08f2d870d3ac058e78e83 /drivers/char/tty_io.c
parentf6f94e2ab1b33f0082ac22d71f66385a60d8157f (diff)
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>
Diffstat (limited to 'drivers/char/tty_io.c')
-rw-r--r--drivers/char/tty_io.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 613c852ee0f..dc184d4b563 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);
}
/**