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mac80211: Fix sleeping allocation under lock in mesh_path_node_copy.

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The mesh_path_node_copy() can be called like this:
mesh_path_add
 `- write_lock(&pathtbl_resize_lock); /* ! */
 `- mesh_table_grow
     `- ->copy_node
           `- mesh_path_node_copy

thus, the GFP_KERNEL is not suitable here.

The acceptable fix, I suppose, is make this allocation GPF_ATOMIC -
the mpath_node being allocated is 4 pointers, i.e. this allocation
is small enough to survive even under a moderate memory pressure.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Pavel Emelyanov 2008-05-07 19:51:51 +04:00 • committed by John W. Linville
parent 00242c40a1
commit 8566dc3fca
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/mesh_pathtbl.c
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@ -469,7 +469,7 @@ static int mesh_path_node_copy(struct hlist_node *p, struct mesh_table *newtbl)
struct mpath_node *node, *new_node;
u32 hash_idx;
new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL);
new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC);
if (new_node == NULL)
return -ENOMEM;