musb: gadget: Read ep0 fifo only if rxcount is non zero

Fixes the read_fifo call with '0' rxcount.

Signed-off-by: Ravi B <ravibabu@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>

diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 32fd0144eb2689978b8eed00f8a36c1b11305e93..22d7ef22720334e86776634ef06ca1b69cbacae8 100644 (file)
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -505,8 +505,10 @@ static void ep0_rxstate(struct musb *musb)
                        req->status = -EOVERFLOW;
                        count = len;
                }
-               musb->ops->read_fifo(&musb->endpoints[0], count, buf);
-               req->actual += count;
+               if (count > 0) {
+                       musb->ops->read_fifo(&musb->endpoints[0], count, buf);
+                       req->actual += count;
+               }
                csr = MUSB_CSR0_P_SVDRXPKTRDY;
                if (count < 64 || req->actual == req->length) {
                        musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;