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Commit ac7f9cfa authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

cfg80211: accept no-op interface mode changes 



When somebody tries to set the interface mode to the existing
mode, don't ask the driver but silently accept the setting.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 86f04680

net/wireless/nl80211.c

+21 −7
Original line number Diff line number Diff line
@@ -607,6 +607,7 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) 
	enum nl80211_iftype type;

	struct net_device *dev;

	u32 _flags, *flags = NULL;

	bool change = false;



	memset(&params, 0, sizeof(params));
@@ -620,12 +621,18 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) 
	type = dev->ieee80211_ptr->iftype;

	dev_put(dev);



	err = -EINVAL;

	if (info->attrs[NL80211_ATTR_IFTYPE]) {

		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);

		if (type > NL80211_IFTYPE_MAX)

		enum nl80211_iftype ntype;



		ntype = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);

		if (type != ntype)

			change = true;

		type = ntype;

		if (type > NL80211_IFTYPE_MAX) {

			err = -EINVAL;

			goto unlock;

		}

	}



	if (!drv->ops->change_virtual_intf ||

	    !(drv->wiphy.interface_modes & (1 << type))) {
@@ -640,6 +647,7 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) 
		}

		params.mesh_id = nla_data(info->attrs[NL80211_ATTR_MESH_ID]);

		params.mesh_id_len = nla_len(info->attrs[NL80211_ATTR_MESH_ID]);

		change = true;

	}



	if (info->attrs[NL80211_ATTR_MNTR_FLAGS]) {
@@ -649,12 +657,18 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) 
		}

		err = parse_monitor_flags(info->attrs[NL80211_ATTR_MNTR_FLAGS],

					  &_flags);

		if (!err)

		if (err)

			goto unlock;



		flags = &_flags;

		change = true;

	}



	if (change)

		err = drv->ops->change_virtual_intf(&drv->wiphy, ifindex,

						    type, flags, &params);

	else

		err = 0;



	dev = __dev_get_by_index(&init_net, ifindex);

	WARN_ON(!dev || (!err && dev->ieee80211_ptr->iftype != type));

net/wireless/wext-compat.c

+9 −2
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info, 
	struct cfg80211_registered_device *rdev;

	struct vif_params vifparams;

	enum nl80211_iftype type;

	int ret;



	if (!wdev)

		return -EOPNOTSUPP;
@@ -96,10 +97,16 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info, 
		return -EINVAL;

	}



	if (type == wdev->iftype)

		return 0;



	memset(&vifparams, 0, sizeof(vifparams));



	return rdev->ops->change_virtual_intf(wdev->wiphy, dev->ifindex, type,

	ret = rdev->ops->change_virtual_intf(wdev->wiphy, dev->ifindex, type,

					     NULL, &vifparams);

	WARN_ON(!ret && wdev->iftype != type);



	return ret;

}

EXPORT_SYMBOL(cfg80211_wext_siwmode);