pch_can: Move MSI processing to probe/remove processing

Currently, in case this driver is integrated as module, and when this
module is re-installed, no interrupts is to be occurred.
For the above issue, move MSI processing to open/release processing.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 15 deletions

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index a1fd3be69a8..ace1fe790ce 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -845,15 +845,6 @@ static int pch_can_open(struct net_device *ndev)
         struct pch_can_priv *priv = netdev_priv(ndev);
         int retval;
 
-        retval = pci_enable_msi(priv->dev);
-        if (retval) {
-                netdev_err(ndev, "PCH CAN opened without MSI\n");
-                priv->use_msi = 0;
-        } else {
-                netdev_err(ndev, "PCH CAN opened with MSI\n");
-                priv->use_msi = 1;
-        }
-
         /* Regstering the interrupt. */
         retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
                              ndev->name, ndev);
@@ -879,9 +870,6 @@ static int pch_can_open(struct net_device *ndev)
 err_open_candev:
         free_irq(priv->dev->irq, ndev);
 req_irq_err:
-        if (priv->use_msi)
-                pci_disable_msi(priv->dev);
-
         pch_can_release(priv);
 
         return retval;
@@ -895,8 +883,6 @@ static int pch_close(struct net_device *ndev)
         napi_disable(&priv->napi);
         pch_can_release(priv);
         free_irq(priv->dev->irq, ndev);
-        if (priv->use_msi)
-                pci_disable_msi(priv->dev);
         close_candev(ndev);
         priv->can.state = CAN_STATE_STOPPED;
         return 0;
@@ -975,12 +961,14 @@ static void __devexit pch_can_remove(struct pci_dev *pdev)
         struct pch_can_priv *priv = netdev_priv(ndev);
 
         unregister_candev(priv->ndev);
-        free_candev(priv->ndev);
         pci_iounmap(pdev, priv->regs);
+        if (priv->use_msi)
+                pci_disable_msi(priv->dev);
         pci_release_regions(pdev);
         pci_disable_device(pdev);
         pci_set_drvdata(pdev, NULL);
         pch_can_reset(priv);
+        free_candev(priv->ndev);
 }
 
 #ifdef CONFIG_PM
@@ -1244,6 +1232,15 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
 
         netif_napi_add(ndev, &priv->napi, pch_can_poll, PCH_RX_OBJ_END);
 
+        rc = pci_enable_msi(priv->dev);
+        if (rc) {
+                netdev_err(ndev, "PCH CAN opened without MSI\n");
+                priv->use_msi = 0;
+        } else {
+                netdev_err(ndev, "PCH CAN opened with MSI\n");
+                priv->use_msi = 1;
+        }
+
         rc = register_candev(ndev);
         if (rc) {
                 dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
@@ -1253,6 +1250,8 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
         return 0;
 
 probe_exit_reg_candev:
+        if (priv->use_msi)
+                pci_disable_msi(priv->dev);
         free_candev(ndev);
 probe_exit_alloc_candev:
         pci_iounmap(pdev, addr);