igb: remove duplicate code for fallback interrupt initialization

Given a small change to igb_init_interrupt_scheme() the function fits
igb_request_irq() for MSI/legacy interrupts initialization as well, instead of
duplicating most of its code there.

Also adding a missing igb_configure() to igb_request_irq() for MSI fallback
to work properly.

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 14 insertions, 15 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index de4ebb306530..615b68c06505 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -122,6 +122,7 @@ static void igb_remove(struct pci_dev *pdev);
 static int igb_sw_init(struct igb_adapter *);
 static int igb_open(struct net_device *);
 static int igb_close(struct net_device *);
+static void igb_configure(struct igb_adapter *);
 static void igb_configure_tx(struct igb_adapter *);
 static void igb_configure_rx(struct igb_adapter *);
 static void igb_clean_all_tx_rings(struct igb_adapter *);
@@ -948,11 +949,14 @@ static void igb_clear_interrupt_scheme(struct igb_adapter *adapter)
  * Attempt to configure interrupts using the best available
  * capabilities of the hardware and kernel.
  **/
-static void igb_set_interrupt_capability(struct igb_adapter *adapter)
+static void igb_set_interrupt_capability(struct igb_adapter *adapter, bool msix)
 {
         int err;
         int numvecs, i;
 
+        if (!msix)
+                goto msi_only;
+
         /* Number of supported queues. */
         adapter->num_rx_queues = adapter->rss_queues;
         if (adapter->vfs_allocated_count)
@@ -1199,12 +1203,12 @@ err_out:
  *
  * This function initializes the interrupts and allocates all of the queues.
  **/
-static int igb_init_interrupt_scheme(struct igb_adapter *adapter)
+static int igb_init_interrupt_scheme(struct igb_adapter *adapter, bool msix)
 {
         struct pci_dev *pdev = adapter->pdev;
         int err;
 
-        igb_set_interrupt_capability(adapter);
+        igb_set_interrupt_capability(adapter, msix);
 
         err = igb_alloc_q_vectors(adapter);
         if (err) {
@@ -1240,20 +1244,15 @@ static int igb_request_irq(struct igb_adapter *adapter)
                 /* fall back to MSI */
                 igb_free_all_tx_resources(adapter);
                 igb_free_all_rx_resources(adapter);
+
                 igb_clear_interrupt_scheme(adapter);
-                if (!pci_enable_msi(pdev))
-                        adapter->flags |= IGB_FLAG_HAS_MSI;
-                adapter->num_tx_queues = 1;
-                adapter->num_rx_queues = 1;
-                adapter->num_q_vectors = 1;
-                err = igb_alloc_q_vectors(adapter);
-                if (err) {
-                        dev_err(&pdev->dev,
-                                "Unable to allocate memory for vectors\n");
+                err = igb_init_interrupt_scheme(adapter, false);
+                if (err)
                         goto request_done;
-                }
+
                 igb_setup_all_tx_resources(adapter);
                 igb_setup_all_rx_resources(adapter);
+                igb_configure(adapter);
         }
 
         igb_assign_vector(adapter->q_vector[0], 0);
@@ -2444,7 +2443,7 @@ static int igb_sw_init(struct igb_adapter *adapter)
                                 GFP_ATOMIC);
 
         /* This call may decrease the number of queues */
-        if (igb_init_interrupt_scheme(adapter)) {
+        if (igb_init_interrupt_scheme(adapter, true)) {
                 dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
                 return -ENOMEM;
         }
@@ -6818,7 +6817,7 @@ static int igb_resume(struct device *dev)
         pci_enable_wake(pdev, PCI_D3hot, 0);
         pci_enable_wake(pdev, PCI_D3cold, 0);
 
-        if (igb_init_interrupt_scheme(adapter)) {
+        if (igb_init_interrupt_scheme(adapter, true)) {
                 dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
                 return -ENOMEM;
         }