IB/mthca: correct log2 calculation
Fix thinko in rd_atomic calculation: ffs(x) - 1 does not find the next power of 2 -- it should be fls(x - 1). Signed-off-by: NJack Morgenstein <jackm@mellanox.co.il> Signed-off-by: NMichael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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