iwlwifi: pcie: remove non-responsive device

If we fail to to grab NIC access because the device is not responding
(i.e. CSR_GP_CNTRL returns 0xFFFFFFFF), remove the device from the PCI
bus, to avoid any further damage, and to let the user space rescan.

In order to inform the userspace that a rescan is needed, we send a
kobject uevent with "INACCESSIBLE".

This functionality is disabled by default, but can be enabled via a
new module parameter called "remove_when_gone".  In the future we may
change this module parameter to include 3 modes instead: do nothing;
auto-rescan or; send uevent.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Rajat Jain <rajatja@google.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index cda66340d357..45ea32796cda 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -383,6 +383,8 @@ struct iwl_self_init_dram {
  * @hw_init_mask: initial unmasked hw causes
  * @fh_mask: current unmasked fh causes
  * @hw_mask: current unmasked hw causes
+ * @in_rescan: true if we have triggered a device rescan
+ * @scheduled_for_removal: true if we have scheduled a device removal
  */
 struct iwl_trans_pcie {
 	struct iwl_rxq *rxq;
@@ -464,6 +466,9 @@ struct iwl_trans_pcie {
 	u32 fh_mask;
 	u32 hw_mask;
 	cpumask_t affinity_mask[IWL_MAX_RX_HW_QUEUES];
+	u16 tx_cmd_queue_size;
+	bool in_rescan;
+	bool scheduled_for_removal;
 };
 
 static inline struct iwl_trans_pcie *