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    Subject[patch 08/40] IB/mthca: Use mmiowb() to avoid firmware commands getting jumbled up

    -stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: Roland Dreier <rdreier@cisco.com>

    Upstream as 76d7cc0345a037e8eea426f8abc710abd22946dd

    Firmware commands are sent to the HCA by writing multiple words to a
    command register block. Access to this block of registers is
    serialized with a mutex. However, on large SGI systems, problems were
    seen with multiple CPUs issuing FW commands at the same time, because
    the writes to the register block may be reordered within the system
    interconnect and reach the HCA in a different order than they were
    issued (even with the mutex). Fix this by adding an mmiowb() before
    dropping the mutex.

    Tested-by: Arthur Kepner <akepner@sgi.com>
    Signed-off-by: Roland Dreier <rolandd@cisco.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/infiniband/hw/mthca/mthca_cmd.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/infiniband/hw/mthca/mthca_cmd.c
    +++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
    @@ -290,6 +290,12 @@ static int mthca_cmd_post(struct mthca_d
    err = mthca_cmd_post_hcr(dev, in_param, out_param, in_modifier,
    op_modifier, op, token, event);

    + /*
    + * Make sure that our HCR writes don't get mixed in with
    + * writes from another CPU starting a FW command.
    + */
    + mmiowb();
    +
    mutex_unlock(&dev->cmd.hcr_mutex);
    return err;
    }
    --
    -
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