netdev - Re: [PATCH wpan-next 04/11] mac802154: Handle associating

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Date: Fri, 2 Jun 2023 17:54:40 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Alexander Aring <alex.aring@...il.com>,
	Stefan Schmidt <stefan@...enfreihafen.org>,
	linux-wpan@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	David Girault <david.girault@...vo.com>,
	Romuald Despres <romuald.despres@...vo.com>,
	Frederic Blain <frederic.blain@...vo.com>,
	Nicolas Schodet <nico@...fr.eu.org>,
	Guilhem Imberton <guilhem.imberton@...vo.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next 04/11] mac802154: Handle associating

On Thu, Jun 01, 2023 at 05:48:10PM +0200, Miquel Raynal wrote:
> Joining a PAN officially goes by associating with a coordinator. This
> coordinator may have been discovered thanks to the beacons it sent in
> the past. Add support to the MAC layer for these associations, which
> require:
> - Sending an association request
> - Receiving an association response
> 
> The association response contains the association status, eventually a
> reason if the association was unsuccessful, and finally a short address
> that we should use for intra-PAN communication from now on, if we
> required one (which is the default, and not yet configurable).
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>

...

> diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
> index cd69bdbfd59f..8bf01bb7e858 100644
> --- a/net/ieee802154/core.c
> +++ b/net/ieee802154/core.c
> @@ -198,6 +198,18 @@ void wpan_phy_free(struct wpan_phy *phy)
>  }
>  EXPORT_SYMBOL(wpan_phy_free);
>  
> +static void cfg802154_free_peer_structures(struct wpan_dev *wpan_dev)
> +{
> +	mutex_lock(&wpan_dev->association_lock);
> +
> +	if (wpan_dev->parent)
> +		kfree(wpan_dev->parent);

Hi Miquel,

a minor nit from my side: There no need to check for NULL before calling
kfree, because kfree will do nothing with a NULL argument.

> +
> +	wpan_dev->association_generation++;
> +
> +	mutex_unlock(&wpan_dev->association_lock);
> +}
> +
>  int cfg802154_switch_netns(struct cfg802154_registered_device *rdev,
>  			   struct net *net)
>  {

...