usb: dwc3: fix bogus test in dwc3_gadget_start_isoc

Zero is a valid value for a microframe number. So remove the bogus
test for non-zero in dwc3_gadget_start_isoc().

Cc: stable@vger.kernel.org
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 60b75c3..fac1149 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1656,7 +1656,7 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
                struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
 {
-       u32 uf;
+       u32 uf, mask;
 
        if (list_empty(&dep->request_list)) {
                dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
@@ -1664,16 +1664,10 @@ static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
                return;
        }
 
-       if (event->parameters) {
-               u32 mask;
-
-               mask = ~(dep->interval - 1);
-               uf = event->parameters & mask;
-               /* 4 micro frames in the future */
-               uf += dep->interval * 4;
-       } else {
-               uf = 0;
-       }
+       mask = ~(dep->interval - 1);
+       uf = event->parameters & mask;
+       /* 4 micro frames in the future */
+       uf += dep->interval * 4;
 
        __dwc3_gadget_kick_transfer(dep, uf, 1);
 }