linux-kernel - Re: [PATCH v2 02/11] firewire: Move fw_card kref functions into linux/firewire.h

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Date:	Wed, 15 Feb 2012 20:10:04 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Chris Boot <bootc@...tc.net>
Cc:	linux1394-devel@...ts.sourceforge.net,
	target-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	agrover@...hat.com, clemens@...isch.de, nab@...ux-iscsi.org
Subject: Re: [PATCH v2 02/11] firewire: Move fw_card kref functions into
 linux/firewire.h

On Feb 15 Chris Boot wrote:
> When writing a firewire driver that doesn't deal with struct fw_device
> objects (e.g. it only publishes FireWire units and doesn't subscribe to
> them), you likely need to keep referenced to struct fw_card objects so
> that you can send messages to other nodes. This patch moves
> fw_card_put(), fw_card_get() and fw_card_release() into the public
> include/linux/firewire.h header instead of drivers/firewire/core.h, and
> adds EXPORT_SYMBOL_GPL(fw_card_release).
> 
> The firewire-sbp-target module requires these so it can keep a reference
> to the fw_card object in order that it can fetch ORBs to execute and
> read/write related data and status information.
> 
> Signed-off-by: Chris Boot <bootc@...tc.net>
> Cc: Clemens Ladisch <clemens@...isch.de>

Acked-by: Stefan Richter <stefanr@...6.in-berlin.de>

> ---
>  drivers/firewire/core-card.c |    1 +
>  drivers/firewire/core.h      |   15 ---------------
>  include/linux/firewire.h     |   14 ++++++++++++++
>  3 files changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c
> index 85661b0..42b180b 100644
> --- a/drivers/firewire/core-card.c
> +++ b/drivers/firewire/core-card.c
> @@ -654,6 +654,7 @@ void fw_card_release(struct kref *kref)
>  
>  	complete(&card->done);
>  }
> +EXPORT_SYMBOL_GPL(fw_card_release);
>  
>  void fw_core_remove_card(struct fw_card *card)
>  {
> diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
> index b45be57..b44657b 100644
> --- a/drivers/firewire/core.h
> +++ b/drivers/firewire/core.h
> @@ -111,21 +111,6 @@ int fw_compute_block_crc(__be32 *block);
>  void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset);
>  void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
>  
> -static inline struct fw_card *fw_card_get(struct fw_card *card)
> -{
> -	kref_get(&card->kref);
> -
> -	return card;
> -}
> -
> -void fw_card_release(struct kref *kref);
> -
> -static inline void fw_card_put(struct fw_card *card)
> -{
> -	kref_put(&card->kref, fw_card_release);
> -}
> -
> -
>  /* -cdev */
>  
>  extern const struct file_operations fw_device_ops;
> diff --git a/include/linux/firewire.h b/include/linux/firewire.h
> index f010307..341e51c 100644
> --- a/include/linux/firewire.h
> +++ b/include/linux/firewire.h
> @@ -138,6 +138,20 @@ struct fw_card {
>  	__be32 maint_utility_register;
>  };
>  
> +static inline struct fw_card *fw_card_get(struct fw_card *card)
> +{
> +	kref_get(&card->kref);
> +
> +	return card;
> +}
> +
> +void fw_card_release(struct kref *kref);
> +
> +static inline void fw_card_put(struct fw_card *card)
> +{
> +	kref_put(&card->kref, fw_card_release);
> +}
> +
>  struct fw_attribute_group {
>  	struct attribute_group *groups[2];
>  	struct attribute_group group;



-- 
Stefan Richter
-=====-===-- --=- -====
http://arcgraph.de/sr/
--
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