iwlwifi: fix D3 debug data buffer memory leak

If the driver is unloaded when D3 debug data pulling is enabled
but not triggered, it doesn't release the data buffer.

Fix this by adding iwl_fw_runtime_free and calling it from the
relevant places.

Fixes: 2d8c261511 ("iwlwifi: add d3 debug data support")
Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/runtime.h

@@ -154,7 +154,11 @@ void iwl_fw_runtime_init(struct iwl_fw_runtime *fwrt, struct iwl_trans *trans,
 			const struct iwl_fw_runtime_ops *ops, void *ops_ctx,
 			struct dentry *dbgfs_dir);
 
-void iwl_fw_runtime_exit(struct iwl_fw_runtime *fwrt);
+static inline void iwl_fw_runtime_free(struct iwl_fw_runtime *fwrt)
+{
+	kfree(fwrt->dump.d3_debug_data);
+	fwrt->dump.d3_debug_data = NULL;
+}
 
 void iwl_fw_runtime_suspend(struct iwl_fw_runtime *fwrt);
 

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

@@ -858,6 +858,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	iwl_mvm_thermal_exit(mvm);
  out_free:
 	iwl_fw_flush_dump(&mvm->fwrt);
+	iwl_fw_runtime_free(&mvm->fwrt);
 
 	if (iwlmvm_mod_params.init_dbg)
 		return op_mode;
@@ -910,6 +911,7 @@ static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
 
 	iwl_mvm_tof_clean(mvm);
 
+	iwl_fw_runtime_free(&mvm->fwrt);
 	mutex_destroy(&mvm->mutex);
 	mutex_destroy(&mvm->d0i3_suspend_mutex);