From: Roland Dreier <rolandd@cisco.com>
Date: Mon, 7 Nov 2005 18:41:29 +0000 (-0800)
Subject: [IB] umad: avoid potential deadlock when unregistering MAD agents
X-Git-Tag: v2.6.15-rc1~45^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f76e82947b977a1008cfd2868351a701c93c69c;p=pandora-kernel.git

[IB] umad: avoid potential deadlock when unregistering MAD agents

ib_unregister_mad_agent() completes all pending MAD sends and waits
for the agent's send_handler routine to return.  umad's send_handler()
calls queue_packet(), which does down_read() on the port mutex to look
up the agent ID.  This means that the port mutex cannot be held for
writing while calling ib_unregister_mad_agent(), or else it will
deadlock.  This patch fixes all the calls to ib_unregister_mad_agent()
in the umad module to avoid this deadlock.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
---

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