ixgbevf: don't release the soft entries

When the ixgbevf driver is opened the request to allocate MSIX irq
vectors may fail.  In that case the driver will call ixgbevf_down()
which will call ixgbevf_irq_disable() to clear the HW interrupt
registers and calls synchronize_irq() using the msix_entries pointer in
the adapter structure.  However, when the function to request the MSIX
irq vectors failed it had already freed the msix_entries which causes
an OOPs from using the NULL pointer in synchronize_irq().

The calls to pci_disable_msix() and to free the msix_entries memory
should not occur if device open fails.  Instead they should be called
during device driver removal to balance with the call to
pci_enable_msix() and the call to allocate msix_entries memory
during the device probe and driver load.

Signed-off-by: Li Xun <xunleer.li@huawei.com>
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index c3db6cd..2b6cb5c 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -944,9 +944,17 @@ free_queue_irqs:
                free_irq(adapter->msix_entries[vector].vector,
                         adapter->q_vector[vector]);
        }
-       pci_disable_msix(adapter->pdev);
-       kfree(adapter->msix_entries);
-       adapter->msix_entries = NULL;
+       /* This failure is non-recoverable - it indicates the system is
+        * out of MSIX vector resources and the VF driver cannot run
+        * without them.  Set the number of msix vectors to zero
+        * indicating that not enough can be allocated.  The error
+        * will be returned to the user indicating device open failed.
+        * Any further attempts to force the driver to open will also
+        * fail.  The only way to recover is to unload the driver and
+        * reload it again.  If the system has recovered some MSIX
+        * vectors then it may succeed.
+        */
+       adapter->num_msix_vectors = 0;
        return err;
 }
 
@@ -2572,6 +2580,15 @@ static int ixgbevf_open(struct net_device *netdev)
        struct ixgbe_hw *hw = &adapter->hw;
        int err;
 
+       /* A previous failure to open the device because of a lack of
+        * available MSIX vector resources may have reset the number
+        * of msix vectors variable to zero.  The only way to recover
+        * is to unload/reload the driver and hope that the system has
+        * been able to recover some MSIX vector resources.
+        */
+       if (!adapter->num_msix_vectors)
+               return -ENOMEM;
+
        /* disallow open during test */
        if (test_bit(__IXGBEVF_TESTING, &adapter->state))
                return -EBUSY;
@@ -2628,7 +2645,6 @@ static int ixgbevf_open(struct net_device *netdev)
 
 err_req_irq:
        ixgbevf_down(adapter);
-       ixgbevf_free_irq(adapter);
 err_setup_rx:
        ixgbevf_free_all_rx_resources(adapter);
 err_setup_tx: