From ef191aded58c5e6860b01f463818584a420a4d6b Mon Sep 17 00:00:00 2001
From: Mat Martineau <mathewm@codeaurora.org>
Date: Wed, 2 May 2012 09:42:00 -0700
Subject: [PATCH] Bluetooth: Restore locking semantics when looking up L2CAP
 channels

As the comment for l2cap_get_chan_by_scid indicated, the function used
to return a locked socket.  The lock for the socket was acquired while
the channel list was also locked.

When locking was moved over to the l2cap_chan structure, the channel
lock was no longer acquired with the channel list still locked.  This
made it possible for the l2cap_chan to be deleted after
conn->chan_lock was released but before l2cap_chan_lock was called.
Making the call to l2cap_chan_lock before releasing conn->chan_lock
makes it impossible for the l2cap_chan to be deleted at the wrong
time.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Reviewed-by: Ulisses Furquim <ulisses@profusion.mobi>
Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
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