From: Pavel Emelyanov <xemul@openvz.org>
Date: Wed, 7 May 2008 15:51:51 +0000 (+0400)
Subject: mac80211: Fix sleeping allocation under lock in mesh_path_node_copy.
X-Git-Tag: v2.6.27-rc1~969^2~337^2~120
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8566dc3fca470454461b161677a5ae3bb3a8c1b8;p=pandora-kernel.git

mac80211: Fix sleeping allocation under lock in mesh_path_node_copy.

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>
---

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