diff options
| author | Ravi Babu <ravibabu@ti.com> | 2013-04-02 13:22:42 +0530 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-04-02 11:42:50 +0300 |
| commit | 538bf07d897008e87eca49cde5970545f3814ac7 (patch) | |
| tree | bd1e62f349ab838c9f494184f5da9ee199671fff /drivers/usb/musb/musb_gadget_ep0.c | |
| parent | 96449f097e3874af0e8ddd721d3ebeed2ec389da (diff) | |
| download | lwn-538bf07d897008e87eca49cde5970545f3814ac7.tar.gz lwn-538bf07d897008e87eca49cde5970545f3814ac7.zip | |
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>
Diffstat (limited to 'drivers/usb/musb/musb_gadget_ep0.c')
| -rw-r--r-- | drivers/usb/musb/musb_gadget_ep0.c | 6 |
1 files changed, 4 insertions, 2 deletions
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; |