linux-kernel - Re: [PATCH 1/2] char_dev: allow setting up and pinning parent devices

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Message-ID: <20121021073928.GV2616@ZenIV.linux.org.uk>
Date:	Sun, 21 Oct 2012 08:39:28 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 1/2] char_dev: allow setting up and pinning parent devices

On Sun, Oct 21, 2012 at 12:24:30AM -0700, Dmitry Torokhov wrote:
> In certain cases (for example when a cdev structure is embedded into
> another object whose lifetime is controlled by a separate device object)
> it is beneficial to tie lifetime of another struct device to the lifetime
> of character device so that related object is not freed until after
> char_dev object is freed. To achieve this allow setting a "parent" device
> for character devices and pin them when doing cdev_add() and unpin when
> last reference to cdev structure is being released.

Why struct device and not simply struct kobject?
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