From: Stephen Warren <swarren@nvidia.com>
Date: Mon, 11 Feb 2013 21:15:32 +0000 (-0700)
Subject: of: fix recursive locking in of_get_next_available_child()
X-Git-Tag: v3.9-rc1~147^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c31a0c052205e3ec24efc3fe18ef70c3e913f2d4;p=pandora-kernel.git

of: fix recursive locking in of_get_next_available_child()

of_get_next_available_child() acquires devtree_lock, then calls
of_device_is_available() which calls of_get_property() which calls
of_find_property() which tries to re-acquire devtree_lock, thus causing
deadlock.

To avoid this, create a new __of_device_is_available() which calls
__of_get_property() instead, which calls __of_find_property(), which
does not take the lock,. Update of_get_next_available_child() to call
the new __of_device_is_available() since it already owns the lock.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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