[PATCH] iwlwifi: MSI support

[Stephen Hemminger <shemminger@linux-foundation.org>]

Add Message Signal Interrupt support to iwlwifi. Tested on 3945.
Enable by default, but have parameter to disable for buggy platforms.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/wireless/mac80211/iwlwifi/base.c	2007-06-13 11:10:10.000000000 -0700
+++ b/drivers/net/wireless/mac80211/iwlwifi/base.c	2007-06-13 11:26:30.000000000 -0700
@@ -80,6 +80,8 @@ int param_antenna = 0;      /* def: 0 = 
 int param_hwcrypto = 0;     /* def: using software encryption */
 int param_qos_enable = 0;
 
+static int disable_msi;
+
 /*
  * module name, copyright, version, etc.
  * NOTE: DRV_NAME is defined in iwlwifi.h for use by iwl-debug.h and printk
@@ -8117,6 +8119,10 @@ static int iwl_pci_probe(struct pci_dev 
 	/* If power management is turned on, default to AC mode */
 	priv->power_mode = IWL_POWER_AC;
 	priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;
+
+	if (!disable_msi)
+		pci_enable_msi(pdev);
+
 	err = request_irq(pdev->irq, iwl_isr, IRQF_SHARED, DRV_NAME, priv);
 	if (err) {
 		IWL_ERROR("Error allocating IRQ %d\n", pdev->irq);
@@ -8155,6 +8161,7 @@ static int iwl_pci_probe(struct pci_dev 
 	sysfs_remove_group(&pdev->dev.kobj, &iwl_attribute_group);
 
  out_release_irq:
+	pci_disable_msi(pdev);
 	free_irq(pdev->irq, priv);
 
  out_destroy_workqueue:
@@ -8224,6 +8231,8 @@ static void iwl_pci_remove(struct pci_de
 	destroy_workqueue(priv->workqueue);
 	priv->workqueue = NULL;
 
+	pci_disable_msi(pdev);
+
 	free_irq(pdev->irq, priv);
 	iounmap(priv->hw_base);
 	pci_release_regions(pdev);
@@ -8352,6 +8361,9 @@ static void __exit iwl_exit(void)
 	pci_unregister_driver(&iwl_driver);
 }
 
+module_param(disable_msi, int, 0);
+MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
+
 module_param_named(antenna, param_antenna, int, 0444);
 MODULE_PARM_DESC(antenna, "select antenna (1=Main, 2=Aux, default 0 [both])");
 module_param_named(disable, param_disable, int, 0444);