[ewg] pull request

[Mike Marciniszyn]

Please pull the following fix from
git.openfabrics.org/~mmarciniszyn/scm/linux-2.6.to_ofed.   This fixes an issue revealed during OFED 1.5.3 testing.

Mike

commit 0012f25501856cf0f47397fbb57e26bf46b11b99
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Wed Feb 16 09:47:41 2011 -0500

    IB/qib: Prevent double completions after a timeout or RNR error

    From: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

    There is a double completion associated with error handling
    for RC QP's.

    The sequence is:
    - The do_rc_ack() routine fields an RNR nack and there are 0 rnr_retries
    configured on the QP.
    - qib_error_qp() stops the pending timer
    - qib_rc_send_complete() is called from sdma_complete()
    - qib_rc_send_complete() starts the timer because the msb of the psn just
    completed says and ack is needed.
    - a bunch of flushes occur as ipoib posts wqe's to an error'ed qp
    - rc_timeout() calls qib_restart_rc()
    - qib_restart_rc() calls qib_send_complete() with a IB_WC_RETRY_EXC_ERR on a
    wqe that has already been completed in the past

    The fix avoids starting the timer since another packet will never
    arrive.

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

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