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mac80211: avoid using synchronize_rcu in ieee80211_set_probe_resp 

This could take a while (100ms+) and may delay sending assoc resp
in AP mode with WPS or P2P GO (as setting the probe resp takes place
there). We've encountered situations where the delay was big enough
to cause connection problems with devices like Galaxy Nexus.
Switch to using call_rcu with a free handler.

[Arik - rework to use plain buffer and instead of skb]

Signed-off-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Eyal Shapira 2012-08-06 14:26:16 +03:00 committed by Johannes Berg
parent f609a43dca
commit aa7a00809c
4 changed files with 21 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
net/mac80211/cfg.c
View File

@ -725,25 +725,23 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy,
static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
const u8 *resp, size_t resp_len)
{
struct sk_buff *new, *old;
struct probe_resp *new, *old;
if (!resp || !resp_len)
return 1;
return -EINVAL;
old = rtnl_dereference(sdata->u.ap.probe_resp);
new = dev_alloc_skb(resp_len);
new = kzalloc(sizeof(struct probe_resp) + resp_len, GFP_KERNEL);
if (!new)
return -ENOMEM;
memcpy(skb_put(new, resp_len), resp, resp_len);
new->len = resp_len;
memcpy(new->data, resp, resp_len);
rcu_assign_pointer(sdata->u.ap.probe_resp, new);
if (old) {
/* TODO: use call_rcu() */
synchronize_rcu();
dev_kfree_skb(old);
}
if (old)
kfree_rcu(old, rcu_head);
return 0;
}

8
net/mac80211/ieee80211_i.h
View File

@ -272,9 +272,15 @@ struct beacon_data {
struct rcu_head rcu_head;
};
struct probe_resp {
struct rcu_head rcu_head;
int len;
u8 data[0];
};
struct ieee80211_if_ap {
struct beacon_data __rcu *beacon;
struct sk_buff __rcu *probe_resp;
struct probe_resp __rcu *probe_resp;
struct list_head vlans;

4
net/mac80211/iface.c
View File

@ -715,7 +715,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sub_if_data *vlan, *tmpsdata;
struct beacon_data *old_beacon =
rtnl_dereference(sdata->u.ap.beacon);
struct sk_buff *old_probe_resp =
struct probe_resp *old_probe_resp =
rtnl_dereference(sdata->u.ap.probe_resp);
/* sdata_running will return false, so this will disable */
@ -727,7 +727,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
synchronize_rcu();
kfree(old_beacon);
kfree_skb(old_probe_resp);
kfree(old_probe_resp);
/* down all dependent devices, that is VLANs */
list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,

7
net/mac80211/tx.c
View File

@ -2481,7 +2481,8 @@ struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ieee80211_if_ap *ap = NULL;
struct sk_buff *presp = NULL, *skb = NULL;
struct sk_buff *skb = NULL;
struct probe_resp *presp = NULL;
struct ieee80211_hdr *hdr;
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
@ -2495,10 +2496,12 @@ struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
if (!presp)
goto out;
skb = skb_copy(presp, GFP_ATOMIC);
skb = dev_alloc_skb(presp->len);
if (!skb)
goto out;
memcpy(skb_put(skb, presp->len), presp->data, presp->len);
hdr = (struct ieee80211_hdr *) skb->data;
memset(hdr->addr1, 0, sizeof(hdr->addr1));