From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Mon, 22 Oct 2012 00:57:19 +0000 (-0700)
Subject: char_dev: pin parent kobject
X-Git-Tag: v3.7-rc3~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f0157f13f42800aa3d9017ebb0fb80a65f7b2de;p=pandora-kernel.git

char_dev: pin parent kobject

In certain cases (for example when a cdev structure is embedded into
another object whose lifetime is controlled by a separate kobject) it is
beneficial to tie lifetime of another object to the lifetime of
character device so that related object is not freed until after
char_dev object is freed.

To achieve this let's pin kobject's parent when doing cdev_add() and
unpin when last reference to cdev structure is being released.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Reading git-diff-tree failed