Something like this should help -- can you verify this fixes the double
free of irq?

 drivers/infiniband/hw/mthca/mthca_eq.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_eq.c 
b/drivers/infiniband/hw/mthca/mthca_eq.c
index 28f0e0c..90e4e45 100644
--- a/drivers/infiniband/hw/mthca/mthca_eq.c
+++ b/drivers/infiniband/hw/mthca/mthca_eq.c
@@ -641,9 +641,11 @@ static void mthca_free_irqs(struct mthca_dev *dev)
        if (dev->eq_table.have_irq)
                free_irq(dev->pdev->irq, dev);
        for (i = 0; i < MTHCA_NUM_EQ; ++i)
-               if (dev->eq_table.eq[i].have_irq)
+               if (dev->eq_table.eq[i].have_irq) {
                        free_irq(dev->eq_table.eq[i].msi_x_vector,
                                 dev->eq_table.eq + i);
+                       dev->eq_table.eq[i].have_irq = 0;
+               }
 }
 
 static int mthca_map_reg(struct mthca_dev *dev,
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