e1000: Fix msi enable leak on error, don't print error message, cleanup

pci_enable_msi failure is a normal event so we should not print any error.
Going over the code I spotted a missing pci_disable_msi() leak when irq
allocation fails. The whole code also needed a cleanup, so I combined the
two different calls to pci_request_irq into a single call making this
look a lot better. All #ifdef CONFIG_PCI_MSI's have been removed.

Compile tested with both CONFIG_PCI_MSI enabled and disabled.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 15 insertions, 28 deletions

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index a9ea67e75c1b..16a6edfeba41 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -333,11 +333,9 @@ struct e1000_adapter {
         struct e1000_tx_ring test_tx_ring;
         struct e1000_rx_ring test_rx_ring;
 
-
         int msg_enable;
-#ifdef CONFIG_PCI_MSI
         boolean_t have_msi;
-#endif
+
         /* to not mess up cache alignment, always add to the bottom */
         boolean_t tso_force;
         boolean_t smart_power_down;     /* phy smart power down */
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 637ae8f68791..49be393e1c1d 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -158,9 +158,7 @@ static struct net_device_stats * e1000_get_stats(struct net_device *netdev);
 static int e1000_change_mtu(struct net_device *netdev, int new_mtu);
 static int e1000_set_mac(struct net_device *netdev, void *p);
 static irqreturn_t e1000_intr(int irq, void *data);
-#ifdef CONFIG_PCI_MSI
 static irqreturn_t e1000_intr_msi(int irq, void *data);
-#endif
 static boolean_t e1000_clean_tx_irq(struct e1000_adapter *adapter,
                                     struct e1000_tx_ring *tx_ring);
 #ifdef CONFIG_E1000_NAPI
@@ -300,31 +298,26 @@ module_exit(e1000_exit_module);
 static int e1000_request_irq(struct e1000_adapter *adapter)
 {
         struct net_device *netdev = adapter->netdev;
-        int flags, err = 0;
+        void (*handler) = &e1000_intr;
+        int irq_flags = IRQF_SHARED;
+        int err;
 
-        flags = IRQF_SHARED;
-#ifdef CONFIG_PCI_MSI
         if (adapter->hw.mac_type >= e1000_82571) {
-                adapter->have_msi = TRUE;
-                if ((err = pci_enable_msi(adapter->pdev))) {
-                        DPRINTK(PROBE, ERR,
-                         "Unable to allocate MSI interrupt Error: %d\n", err);
-                        adapter->have_msi = FALSE;
+                adapter->have_msi = !pci_enable_msi(adapter->pdev);
+                if (adapter->have_msi) {
+                        handler = &e1000_intr_msi;
+                        irq_flags = 0;
                 }
         }
-        if (adapter->have_msi) {
-                flags &= ~IRQF_SHARED;
-                err = request_irq(adapter->pdev->irq, &e1000_intr_msi, flags,
-                                  netdev->name, netdev);
-                if (err)
-                        DPRINTK(PROBE, ERR,
-                               "Unable to allocate interrupt Error: %d\n", err);
-        } else
-#endif
-        if ((err = request_irq(adapter->pdev->irq, &e1000_intr, flags,
-                               netdev->name, netdev)))
+
+        err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,
+                          netdev);
+        if (err) {
+                if (adapter->have_msi)
+                        pci_disable_msi(adapter->pdev);
                 DPRINTK(PROBE, ERR,
                         "Unable to allocate interrupt Error: %d\n", err);
+        }
 
         return err;
 }
@@ -335,10 +328,8 @@ static void e1000_free_irq(struct e1000_adapter *adapter)
 
         free_irq(adapter->pdev->irq, netdev);
 
-#ifdef CONFIG_PCI_MSI
         if (adapter->have_msi)
                 pci_disable_msi(adapter->pdev);
-#endif
 }
 
 /**
@@ -3744,7 +3735,6 @@ e1000_update_stats(struct e1000_adapter *adapter)
 
         spin_unlock_irqrestore(&adapter->stats_lock, flags);
 }
-#ifdef CONFIG_PCI_MSI
 
 /**
  * e1000_intr_msi - Interrupt Handler
@@ -3810,7 +3800,6 @@ e1000_intr_msi(int irq, void *data)
 
         return IRQ_HANDLED;
 }
-#endif
 
 /**
  * e1000_intr - Interrupt Handler