[ewg] 1.6 pull request: IB/qib: Fix potential deadlock with link down interrupt

[Mike Marciniszyn]

Vlad,

Please pull the following patch from ~mmarciniszyn/scm/ofed_1_6/linux-2.6.

Thanks!
Mike

commit afec81fe25b83cc314fd366a58b841e959735b31
Author: Ram Vepa <ram.vepa at qlogic.com>
Date:   Fri May 27 09:54:02 2011 -0400

    IB/qib: Fix potential deadlock with link down interrupt

    There is a possibility of a deadlock due to the way locks are acquired and
    released in qib_set_uevent_bits(). The function qib_set_uevent_bits() is cal
    in process context calling spin_lock() and spin_unlock() while this same loc
    is acquired/released in interrupt context which can lead to a deadlock when
    running on the same cpu.

    The fix is to replace spin_lock() and spin_unlock() with spin_lock_irqsave()
    and spin_unlock_irqrestore() respectively in qib_set_uevent_bits().

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

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