From 538bf07d897008e87eca49cde5970545f3814ac7 Mon Sep 17 00:00:00 2001 From: Ravi Babu Date: Tue, 2 Apr 2013 13:22:42 +0530 Subject: [PATCH] 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 Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_gadget_ep0.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c index c9c1ac4..2af45a0 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; -- 2.7.4