1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c
index 16c842997291..673e3624713e 100644
--- a/drivers/net/usb/cdc_mbim.c
+++ b/drivers/net/usb/cdc_mbim.c
@@ -323,6 +323,11 @@ static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
                 goto error;
         }
 
+        /*
+         * Both usbnet_suspend() and subdriver->suspend() MUST return 0
+         * in system sleep context, otherwise, the resume callback has
+         * to recover device from previous suspend failure.
+         */
         ret = usbnet_suspend(intf, message);
         if (ret < 0)
                 goto error;