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>
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 691d64e..e0f6f03 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -8494,6 +8494,8 @@
 	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);