IB/mthca: Don't double-free IRQs when falling back from MSI-X to INTx

When both MSI-X and legacy INTx fail to generate an interrupt, the
driver frees the MSI-X interrupts twice.  Fix this by clearing the
have_irq flag for the MSI-X interrupts when they are freed the first
time.

Reported-by: Yinghai Lu <yhlu.kernel@gmail.com>
Tested-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mthca/mthca_eq.c b/drivers/infiniband/hw/mthca/mthca_eq.c
index 28f0e0c..90e4e45 100644 (file)
--- 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,