Re: [PATCH 1/2] char_dev: allow setting up and pinning parent devices
From: Al Viro
Date: Sun Oct 21 2012 - 03:39:23 EST
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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