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From: Felix Fietkau <nbd@nbd.name>
Date: Sat, 16 Mar 2019 17:43:58 +0100
Subject: [PATCH] mac80211: mesh: drop redundant rcu_read_lock/unlock calls
The callers of these functions are all within RCU locked sections
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -1112,16 +1112,13 @@ int mesh_nexthop_resolve(struct ieee8021
struct mesh_path *mpath;
struct sk_buff *skb_to_free = NULL;
u8 *target_addr = hdr->addr3;
- int err = 0;
/* Nulls are only sent to peers for PS and should be pre-addressed */
if (ieee80211_is_qos_nullfunc(hdr->frame_control))
return 0;
- rcu_read_lock();
- err = mesh_nexthop_lookup(sdata, skb);
- if (!err)
- goto endlookup;
+ if (!mesh_nexthop_lookup(sdata, skb))
+ return 0;
/* no nexthop found, start resolving */
mpath = mesh_path_lookup(sdata, target_addr);
@@ -1129,8 +1126,7 @@ int mesh_nexthop_resolve(struct ieee8021
mpath = mesh_path_add(sdata, target_addr);
if (IS_ERR(mpath)) {
mesh_path_discard_frame(sdata, skb);
- err = PTR_ERR(mpath);
- goto endlookup;
+ return PTR_ERR(mpath);
}
}
@@ -1143,13 +1139,10 @@ int mesh_nexthop_resolve(struct ieee8021
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
ieee80211_set_qos_hdr(sdata, skb);
skb_queue_tail(&mpath->frame_queue, skb);
- err = -ENOENT;
if (skb_to_free)
mesh_path_discard_frame(sdata, skb_to_free);
-endlookup:
- rcu_read_unlock();
- return err;
+ return -ENOENT;
}
/**
@@ -1169,13 +1162,10 @@ int mesh_nexthop_lookup(struct ieee80211
struct sta_info *next_hop;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
u8 *target_addr = hdr->addr3;
- int err = -ENOENT;
- rcu_read_lock();
mpath = mesh_path_lookup(sdata, target_addr);
-
if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
- goto endlookup;
+ return -ENOENT;
if (time_after(jiffies,
mpath->exp_time -
@@ -1190,12 +1180,10 @@ int mesh_nexthop_lookup(struct ieee80211
memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
- err = 0;
+ return 0;
}
-endlookup:
- rcu_read_unlock();
- return err;
+ return -ENOENT;
}
void mesh_path_timer(struct timer_list *t)
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -217,7 +217,7 @@ static struct mesh_path *mpath_lookup(st
{
struct mesh_path *mpath;
- mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params);
+ mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params);
if (mpath && mpath_expired(mpath)) {
spin_lock_bh(&mpath->state_lock);
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