[PATCH] usb: musb: add code comment for clarification

[Gustavo A. R. Silva]

Add code comment to make it clear that the fall-through is intentional.
Read the link for more details: https://lkml.org/lkml/2017/2/9/292

Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
---
 drivers/usb/musb/musb_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 892088f..1aec986 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1869,6 +1869,7 @@ static void musb_pm_runtime_check_session(struct  
musb *musb)

                        return;
                }
+               /* fall through */
        case MUSB_QUIRK_A_DISCONNECT_19:
                if (musb->quirk_retries--) {
                        musb_dbg(musb,
--
2.5.0