iwlwifi: mvm: make sure state isn't in d0i3 when collecting fw dbg

This makes sure that we're not trying to read/write any of
the FW debug data collected during d0i3.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/debugfs.c

@@ -1390,6 +1390,7 @@ static ssize_t iwl_dbgfs_d0i3_refs_read(struct file *file,
 	PRINT_MVM_REF(IWL_MVM_REF_TM_CMD);
 	PRINT_MVM_REF(IWL_MVM_REF_EXIT_WORK);
 	PRINT_MVM_REF(IWL_MVM_REF_PROTECT_CSA);
+	PRINT_MVM_REF(IWL_MVM_REF_FW_DBG_COLLECT);
 
 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 }

drivers/net/wireless/iwlwifi/mvm/mvm.h

@@ -276,6 +276,7 @@ enum iwl_mvm_ref_type {
 	IWL_MVM_REF_TM_CMD,
 	IWL_MVM_REF_EXIT_WORK,
 	IWL_MVM_REF_PROTECT_CSA,
+	IWL_MVM_REF_FW_DBG_COLLECT,
 
 	/* update debugfs.c when changing this */
 

drivers/net/wireless/iwlwifi/mvm/ops.c

@@ -818,9 +818,14 @@ static void iwl_mvm_fw_error_dump_wk(struct work_struct *work)
 	struct iwl_mvm *mvm =
 		container_of(work, struct iwl_mvm, fw_error_dump_wk);
 
+	if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_FW_DBG_COLLECT))
+		return;
+
 	mutex_lock(&mvm->mutex);
 	iwl_mvm_fw_error_dump(mvm);
 	mutex_unlock(&mvm->mutex);
+
+	iwl_mvm_unref(mvm, IWL_MVM_REF_FW_DBG_COLLECT);
 }
 
 void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error)