iwlwifi: read rfkill during resume

When resuming from hibernate or suspend,
the status of the rfkill switch isn't
known since it might have been toggled
while the system was asleep. Therefore,
we need to read out the status at resume
time to make sure the system knows about
an up-to-date status.
Reported-by: NMark Tung <mark.y.tung@intel.com>
Tested-by: NMark Tung <mark.y.tung@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NReinette Chatre <reinette.chatre@intel.com>

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

@@ -2845,6 +2845,7 @@ int iwl_pci_resume(struct pci_dev *pdev)
 {
 	struct iwl_priv *priv = pci_get_drvdata(pdev);
 	int ret;
+	bool hw_rfkill = false;
 
 	/*
 	 * We disable the RETRY_TIMEOUT register (0x41) to keep
@@ -2859,6 +2860,17 @@ int iwl_pci_resume(struct pci_dev *pdev)
 	pci_restore_state(pdev);
 	iwl_enable_interrupts(priv);
 
+	if (!(iwl_read32(priv, CSR_GP_CNTRL) &
+				CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
+		hw_rfkill = true;
+
+	if (hw_rfkill)
+		set_bit(STATUS_RF_KILL_HW, &priv->status);
+	else
+		clear_bit(STATUS_RF_KILL_HW, &priv->status);
+
+	wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rfkill);
+
 	return 0;
 }
 EXPORT_SYMBOL(iwl_pci_resume);