From: Ravi Babu <ravibabu@ti.com>
Date: Tue, 2 Apr 2013 07:52:42 +0000 (+0530)
Subject: usb: musb: gadget: read ep0 fifo only if rxcount is non zero
X-Git-Tag: next-20130404~27^2~35
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=538bf07d897008e87eca49cde5970545f3814ac7;p=karo-tx-linux.git

usb: musb: gadget: read ep0 fifo only if rxcount is non zero

avoid reading fifo rxcount is zero of fifo is empty, hence
read fifo only if rxcount is non-zero

Signed-off-by: Ravi Babu <ravibabu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index c9c1ac4e075f..2af45a0c8930 100644
--- 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_read_fifo(&musb->endpoints[0], count, buf);
-		req->actual += count;
+		if (count > 0) {
+			musb_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;