iwlwifi: disable interrupts before calling request_irq

Disable interrupts in the iwl4965 before calling request_irq() for
the case that the previous OS or the BIOS left a pending interrupt in
the chip. This behavior has been observed on some laptops such as T61
Thinkpads and Toshiba Portege R500

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -8494,6 +8494,8 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	priv->power_mode = IWL_POWER_AC;
 	priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;
 
+	iwl_disable_interrupts(priv);
+
 	pci_enable_msi(pdev);
 
 	err = request_irq(pdev->irq, iwl_isr, IRQF_SHARED, DRV_NAME, priv);

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -9122,6 +9122,8 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	priv->power_mode = IWL_POWER_AC;
 	priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;
 
+	iwl_disable_interrupts(priv);
+
 	pci_enable_msi(pdev);
 
 	err = request_irq(pdev->irq, iwl_isr, IRQF_SHARED, DRV_NAME, priv);