linux-kernel - Re: [PATCH 11/15] rfkill: add notifier chains support

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Date:	Mon, 19 May 2008 10:44:03 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	linux-kernel@...r.kernel.org, Ivo van Doorn <IvDoorn@...il.com>
Subject: Re: [PATCH 11/15] rfkill: add notifier chains support

On Sun, 2008-05-18 at 15:48 -0300, Henrique de Moraes Holschuh wrote:
> Add a notifier chain for use by the rfkill class.  This notifier chain
> signals the following events (more to be added when needed):
> 
>   1. rfkill: rfkill device state has changed
> 
> A pointer to the rfkill struct will be passed as a parameter.
> 
> The notifier message types have been added to include/linux/rfkill.h
> instead of to include/linux/notifier.h in order to avoid the madness of
> modifying a header used globally (and that triggers an almost full tree
> rebuild every time it is touched) with information that is of interest only
> to code that includes the rfkill.h header.
> 
> Signed-off-by: Henrique de Moraes Holschuh <hmh@....eng.br>
> Cc: Ivo van Doorn <IvDoorn@...il.com>
> ---
>  include/linux/rfkill.h |    7 +++++
>  net/rfkill/rfkill.c    |   70 +++++++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 74 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h
> index c0cab7d..98667be 100644
> --- a/include/linux/rfkill.h
> +++ b/include/linux/rfkill.h
> @@ -117,4 +117,11 @@ static inline char *rfkill_get_led_name(struct rfkill *rfkill)
>  #endif
>  }
>  
> +/* rfkill notification chain */
> +#define RFKILL_STATE_CHANGED		0x0001	/* state of a normal rfkill
> +						   switch has changed */
> +
> +int register_rfkill_notifier(struct notifier_block *nb);
> +int unregister_rfkill_notifier(struct notifier_block *nb);
> +
>  #endif /* RFKILL_H */
> diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
> index f11220b..251defe 100644
> --- a/net/rfkill/rfkill.c
> +++ b/net/rfkill/rfkill.c
> @@ -46,6 +46,49 @@ MODULE_PARM_DESC(default_state,
>  
>  static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
>  
> +static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
> +
> +
> +/**
> + * register_rfkill_notifier - Add notifier to rfkill notifier chain
> + * @nb: pointer to the new entry to add to the chain
> + *
> + * See blocking_notifier_chain_register() for return value and further
> + * observations.
> + *
> + * Adds a notifier to the rfkill notifier chain.  The chain will be
> + * called with a pointer to the relevant rfkill structure as a parameter,
> + * refer to include/linux/rfkill.h for the possible events.
> + *
> + * Notifiers added to this chain are to always return NOTIFY_DONE.  This
> + * chain is a blocking notifier chain: notifiers can sleep.
> + *
> + * Calls to this chain may have been done through a workqueue.  One must
> + * one must assume unordered assynchronous behaviour, there is no way to
One must, one must...,         asynchronous
...

   Thomas



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