diff --git a/scanner/async_scanner.cpp b/scanner/async_scanner.cpp
index 8f29269..0157ba5 100644
--- a/scanner/async_scanner.cpp
+++ b/scanner/async_scanner.cpp
@@ -257,6 +257,11 @@ dyn_mem_ptr async_scanner::handle_set_opt(LPPACK_BASE pack, uint32_t* used, pack
 		cfg_ret->max_size = cfg->max_size;
 		cfg_ret->type = cfg->type;
 		err = cfg_mgr_->update_data(cfg->data + cfg->name_off, cfg_ret->data + cfg_ret->val_off);
+		if(err == SCANNER_ERR_RELOAD_OPT_PARAM || err == SCANNER_ERR_RELOAD_IMAGE_PARAM || err == SCANNER_ERR_CONFIGURATION_CHANGED)
+		{
+			after = err;
+			err = SCANNER_ERR_OK;
+		}
 		cfg_ret->after_do = after;
 		cfg_ret->val_size = val_size;
 		BASE_PACKET_REPLY(*pk, pack->cmd + 1, pack->pack_id, err);
diff --git a/sdk/base/packet.h b/sdk/base/packet.h
index 097339a..16f173a 100644
--- a/sdk/base/packet.h
+++ b/sdk/base/packet.h
@@ -295,7 +295,7 @@ typedef struct _config_val
 	uint8_t		type;		// same as SANE_Value_Type
 	uint8_t		name_off;	// name offset of the option in data, end with '\0'
 	uint8_t		val_off;	// option value offset in data
-	uint8_t		after_do;	// see SANE_INFO_xxx in sane.h
+	uint16_t	after_do;	// see SCANNER_ERR_RELOAD_xxx in hgscanner_error.h
 	uint16_t	val_size;	// real size of value
 	uint16_t	max_size;	// max size of this option, this value has given in gb_json::size
 	char	data[0];		// contains value and name. fetch them according name_off and val_off members.
diff --git a/usb/usb_io.cpp b/usb/usb_io.cpp
index b3c986c..190b729 100644
--- a/usb/usb_io.cpp
+++ b/usb/usb_io.cpp
@@ -470,7 +470,8 @@ void async_usb_gadget::thread_read_ep0(void)
 		ret = wait_fd_event(fd);
 		if( !run_ || ret <= 0 )
 		{
-			utils::to_log(LOG_LEVEL_ALL, "select EP0(%d) failed: %d(%s)\n", fd, errno, strerror(errno));
+			if(run_)
+				utils::to_log(LOG_LEVEL_ALL, "select EP0(%d) failed: %d(%s)\n", fd, errno, strerror(errno));
 			break;
 		}