usb: gadget: mv_udc: clarify a switch with an implicit fall-through

Rearrange statements in mv_ep_enable function so that it’s obvious
what the switch does and how zlt, ios and mult variables are
initialised.  Most notably, this gets rid of an implicit fall-through
so people don’t have to wonder whether it was intenional or not.

Addresses-Coverity-ID: 201385
Reported-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index 27ebb0d..76f56c5 100644 (file)
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -445,7 +445,8 @@ static int mv_ep_enable(struct usb_ep *_ep,
        struct mv_dqh *dqh;
        u16 max = 0;
        u32 bit_pos, epctrlx, direction;
-       unsigned char zlt = 0, ios = 0, mult = 0;
+       const unsigned char zlt = 1;
+       unsigned char ios, mult;
        unsigned long flags;
 
        ep = container_of(_ep, struct mv_ep, ep);
@@ -465,8 +466,6 @@ static int mv_ep_enable(struct usb_ep *_ep,
         * disable HW zero length termination select
         * driver handles zero length packet through req->req.zero
         */
-       zlt = 1;
-
        bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num);
 
        /* Check if the Endpoint is Primed */
@@ -481,16 +480,16 @@ static int mv_ep_enable(struct usb_ep *_ep,
                        (unsigned)bit_pos);
                goto en_done;
        }
+
        /* Set the max packet length, interrupt on Setup and Mult fields */
+       ios = 0;
+       mult = 0;
        switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
        case USB_ENDPOINT_XFER_BULK:
-               zlt = 1;
-               mult = 0;
+       case USB_ENDPOINT_XFER_INT:
                break;
        case USB_ENDPOINT_XFER_CONTROL:
                ios = 1;
-       case USB_ENDPOINT_XFER_INT:
-               mult = 0;
                break;
        case USB_ENDPOINT_XFER_ISOC:
                /* Calculate transactions needed for high bandwidth iso */