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mac80211: Brush up error paths in mesh_path_add. 

There are already tree paths, that do incremental rollbacks, so
merge them together, rename labels and format the code to look a
bit nicer.

(I do not mind dropping/delaying this patch however).

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Pavel Emelyanov 2008-05-06 18:53:43 +04:00 committed by John W. Linville
parent b679aeb304
commit 402d7752ed
1 changed files with 20 additions and 22 deletions
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42
net/mac80211/mesh_pathtbl.c
View File

@ -158,19 +158,14 @@ int mesh_path_add(u8 *dst, struct net_device *dev)
if (atomic_add_unless(&sdata->u.sta.mpaths, 1, MESH_MAX_MPATHS) == 0) if (atomic_add_unless(&sdata->u.sta.mpaths, 1, MESH_MAX_MPATHS) == 0)
return -ENOSPC; return -ENOSPC;
err = -ENOMEM;
new_mpath = kzalloc(sizeof(struct mesh_path), GFP_KERNEL); new_mpath = kzalloc(sizeof(struct mesh_path), GFP_KERNEL);
if (!new_mpath) { if (!new_mpath)
atomic_dec(&sdata->u.sta.mpaths); goto err_path_alloc;
err = -ENOMEM;
goto endadd2;
}
new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL); new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL);
if (!new_node) { if (!new_node)
kfree(new_mpath); goto err_node_alloc;
atomic_dec(&sdata->u.sta.mpaths);
err = -ENOMEM;
goto endadd2;
}
read_lock(&pathtbl_resize_lock); read_lock(&pathtbl_resize_lock);
memcpy(new_mpath->dst, dst, ETH_ALEN); memcpy(new_mpath->dst, dst, ETH_ALEN);
@ -189,16 +184,11 @@ int mesh_path_add(u8 *dst, struct net_device *dev)
spin_lock(&mesh_paths->hashwlock[hash_idx]); spin_lock(&mesh_paths->hashwlock[hash_idx]);
err = -EEXIST;
hlist_for_each_entry(node, n, bucket, list) { hlist_for_each_entry(node, n, bucket, list) {
mpath = node->mpath; mpath = node->mpath;
if (mpath->dev == dev && memcmp(dst, mpath->dst, ETH_ALEN) if (mpath->dev == dev && memcmp(dst, mpath->dst, ETH_ALEN) == 0)
== 0) { goto err_exists;
err = -EEXIST;
atomic_dec(&sdata->u.sta.mpaths);
kfree(new_node);
kfree(new_mpath);
goto endadd;
}
} }
hlist_add_head_rcu(&new_node->list, bucket); hlist_add_head_rcu(&new_node->list, bucket);
@ -206,10 +196,9 @@ int mesh_path_add(u8 *dst, struct net_device *dev)
mesh_paths->mean_chain_len * (mesh_paths->hash_mask + 1)) mesh_paths->mean_chain_len * (mesh_paths->hash_mask + 1))
grow = 1; grow = 1;
endadd:
spin_unlock(&mesh_paths->hashwlock[hash_idx]); spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock); read_unlock(&pathtbl_resize_lock);
if (!err && grow) { if (grow) {
struct mesh_table *oldtbl, *newtbl; struct mesh_table *oldtbl, *newtbl;
write_lock(&pathtbl_resize_lock); write_lock(&pathtbl_resize_lock);
@ -225,7 +214,16 @@ endadd:
synchronize_rcu(); synchronize_rcu();
mesh_table_free(oldtbl, false); mesh_table_free(oldtbl, false);
} }
endadd2: return 0;
err_exists:
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
kfree(new_node);
err_node_alloc:
kfree(new_mpath);
err_path_alloc:
atomic_dec(&sdata->u.sta.mpaths);
return err; return err;
} }