Re: [patch] add private data to notifier_block

[Alan Stern]

On Tue, 21 Mar 2006, Kristen Accardi wrote:

> While most current uses of notifier_block use a global struct, I would
> like to be able to use it on a per device basis for drivers which have
> multiple device instances.  I would also like to be able to have a
> private data struct associated with the notifier block so that per
> device data can be easily accessed.  This patch will modify the
> notifier_block struct to add a void *, and will require no modifications
> to any other users of the notifier_block.
> 
> Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
> 
> ---
>  include/linux/notifier.h |    1 +
>  1 files changed, 1 insertion(+)
> 
> --- 2.6-git-kca.orig/include/linux/notifier.h
> +++ 2.6-git-kca/include/linux/notifier.h
> @@ -15,6 +15,7 @@ struct notifier_block
>  {
>  	int (*notifier_call)(struct notifier_block *self, unsigned long, void *);
>  	struct notifier_block *next;
> +	void *data;
>  	int priority;
>  };

I still think this isn't really needed.  The same effect can be 
accomplished by embedding a notifier_block struct within a larger 
structure that also contains the data pointer.

On the other hand this isn't a terribly big change, so I don't actually 
object to it.

Alan Stern

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