From: Johannes Berg <johannes.berg@xxxxxxxxx>
Reject wmediumd registrations when any devices have multi-channel
capability, but register the generic netlink family unconditionally
to make it possible to add new commands that shouldn't depend on
the number of (default) channels.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
drivers/net/wireless/mac80211_hwsim.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 68375f7..e623a9e 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2240,6 +2240,22 @@ out:
static int hwsim_register_received_nl(struct sk_buff *skb_2,
struct genl_info *info)
{
+ struct mac80211_hwsim_data *data;
+ int chans = 1;
+
+ spin_lock_bh(&hwsim_radio_lock);
+ list_for_each_entry(data, &hwsim_radios, list)
+ chans = max(chans, data->channels);
+ spin_unlock_bh(&hwsim_radio_lock);
+
+ /* In the future we should revise the userspace API and allow it
+ * to set a flag that it does support multi-channel, then we can
+ * let this pass conditionally on the flag.
+ * For current userspace, prohibit it since it won't work right.
+ */
+ if (chans > 1)
+ return -EOPNOTSUPP;
+
if (wmediumd_portid)
return -EBUSY;
@@ -2297,10 +2313,6 @@ static int hwsim_init_netlink(void)
{
int rc;
- /* userspace test API hasn't been adjusted for multi-channel */
- if (channels > 1)
- return 0;
-
printk(KERN_INFO "mac80211_hwsim: initializing netlink\n");
rc = genl_register_family_with_ops(&hwsim_genl_family, hwsim_ops);
@@ -2320,10 +2332,6 @@ failure:
static void hwsim_exit_netlink(void)
{
- /* userspace test API hasn't been adjusted for multi-channel */
- if (channels > 1)
- return;
-
/* unregister the notifier */
netlink_unregister_notifier(&hwsim_netlink_notifier);
/* unregister the family */
--
1.8.5.1
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