IB/ipath: Fix hang on module unload
Handle the case where posting a send is requested when the link is down. This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1117>. Signed-off-by: Yannick Cote <yannick.cote@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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