iwlwifi: pcie: don't report RF-kill enabled while shutting down

When toggling the RF-kill pin quickly in succession, the driver can
get rather confused because it might be in the process of shutting
down, expecting all commands to go through quickly due to rfkill,
but the transport already thinks the device is accessible again,
even though it previously shut it down. This leads to bugs, and I
even observed a kernel panic.

Avoid this by making the PCIe code only report that the radio is
enabled again after the higher layers actually decided to shut it
off.

This also pulls out this common RF-kill checking code into a common
function called by both transport generations and also moves it to
the direct method - in the internal helper we don't really care
about the RF-kill status anymore since we won't report it up until
the stop anyway.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index 2d92d3708619..a8fb77483313 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -766,7 +766,6 @@ static int iwl_pci_resume(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct iwl_trans *trans = pci_get_drvdata(pdev);
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-	bool hw_rfkill;
 
 	/* Before you put code here, think about WoWLAN. You cannot check here
 	 * whether WoWLAN is enabled or not, and your code will run even if
@@ -783,16 +782,13 @@ static int iwl_pci_resume(struct device *device)
 		return 0;
 
 	/*
-	 * Enable rfkill interrupt (in order to keep track of
-	 * the rfkill status). Must be locked to avoid processing
-	 * a possible rfkill interrupt between reading the state
-	 * and calling iwl_trans_pcie_rf_kill() with it.
+	 * Enable rfkill interrupt (in order to keep track of the rfkill
+	 * status). Must be locked to avoid processing a possible rfkill
+	 * interrupt while in iwl_trans_check_hw_rf_kill().
 	 */
 	mutex_lock(&trans_pcie->mutex);
 	iwl_enable_rfkill_int(trans);
-
-	hw_rfkill = iwl_is_rfkill_set(trans);
-	iwl_trans_pcie_rf_kill(trans, hw_rfkill);
+	iwl_trans_check_hw_rf_kill(trans);
 	mutex_unlock(&trans_pcie->mutex);
 
 	return 0;