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

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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>
This commit is contained in:
Ravi Babu 2013-04-02 13:22:42 +05:30 committed by Felipe Balbi
parent 96449f097e
commit 538bf07d89
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/musb/musb_gadget_ep0.c
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@ -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;