While disassociating from a PAN ourselves, let's set the maximum number of associations temporarily to zero to be sure no new device tries to associate with us.
Signed-off-by: Miquel Raynal <[email protected]> --- include/net/cfg802154.h | 4 +++- net/ieee802154/pan.c | 8 +++++++- net/mac802154/cfg.c | 11 ++++++++--- 3 files changed, 18 insertions(+), 5 deletions(-) diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h index a64bbcd71f10..cd95711b12b8 100644 --- a/include/net/cfg802154.h +++ b/include/net/cfg802154.h @@ -589,8 +589,10 @@ cfg802154_device_is_child(struct wpan_dev *wpan_dev, * cfg802154_set_max_associations - Limit the number of future associations * @wpan_dev: the wpan device * @max: the maximum number of devices we accept to associate + * @return: the old maximum value */ -void cfg802154_set_max_associations(struct wpan_dev *wpan_dev, unsigned int max); +unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev, + unsigned int max); /** * cfg802154_get_free_short_addr - Get a free address among the known devices diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c index fb5b0af2ef68..249df7364b3e 100644 --- a/net/ieee802154/pan.c +++ b/net/ieee802154/pan.c @@ -94,10 +94,16 @@ __le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev) } EXPORT_SYMBOL_GPL(cfg802154_get_free_short_addr); -void cfg802154_set_max_associations(struct wpan_dev *wpan_dev, unsigned int max) +unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev, + unsigned int max) { + unsigned int old_max; + lockdep_assert_held(&wpan_dev->association_lock); + old_max = wpan_dev->max_associations; wpan_dev->max_associations = max; + + return old_max; } EXPORT_SYMBOL_GPL(cfg802154_set_max_associations); diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c index 17e2032fac24..ef7f23af043f 100644 --- a/net/mac802154/cfg.c +++ b/net/mac802154/cfg.c @@ -389,6 +389,7 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy, struct ieee802154_local *local = wpan_phy_priv(wpan_phy); struct ieee802154_pan_device *child, *tmp; struct ieee802154_sub_if_data *sdata; + unsigned int max_assoc; u64 eaddr; int ret; @@ -397,6 +398,7 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy, /* Start by disassociating all the children and preventing new ones to * attempt associations. */ + max_assoc = cfg802154_set_max_associations(wpan_dev, 0); list_for_each_entry_safe(child, tmp, &wpan_dev->children, node) { ret = mac802154_send_disassociation_notif(sdata, child, IEEE802154_COORD_WISHES_DEVICE_TO_LEAVE); @@ -429,14 +431,17 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy, if (local->hw.flags & IEEE802154_HW_AFILT) { ret = drv_set_pan_id(local, wpan_dev->pan_id); if (ret < 0) - return ret; + goto reset_mac_assoc; ret = drv_set_short_addr(local, wpan_dev->short_addr); if (ret < 0) - return ret; + goto reset_mac_assoc; } - return 0; +reset_mac_assoc: + cfg802154_set_max_associations(wpan_dev, max_assoc); + + return ret; } static int mac802154_disassociate_child(struct wpan_phy *wpan_phy, -- 2.34.1
