iwlwifi: grap nic access before accessing periphery registers

We need to grap nic access before accessing periphery registers.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -241,9 +241,11 @@ static void iwl5000_nic_config(struct iwl_priv *priv)
 	 * (PCIe power is lost before PERST# is asserted),
 	 * causing ME FW to lose ownership and not being able to obtain it back.
 	 */
-	 iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
+	iwl_grab_nic_access(priv);
+	iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
 				APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS,
 				~APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS);
+	iwl_release_nic_access(priv);
 
 	spin_unlock_irqrestore(&priv->lock, flags);
 }