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>

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 28f0e0c40d7..90e4e450a12 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,