Hi,
> On 07/19/2012 03:22 PM, Gupta, Ajay Kumar wrote:
>
> >>> There is no need to call read_fifo for zero byte length.
>
> >> The same as there's no need to write, and not only here?
>
> > Yes, it applies to write also but seems write is taken care
> > for zero byte length.
>
> Frankly speaking, I don't see it. And what about non-0 endpoints?
We had seen zero byte rx on control endpoints but as it can happen
on non-0 endpoint so it is best to put this check in read_fifo and
write_fifo as you suggested.
I will update the patch and resubmit.
Thanks,
Ajay
>
> >>> Signed-off-by: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
> >>> ---
> >>> 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 e40d764..d762ddb 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) {
> >>> + musb_read_fifo(&musb->endpoints[0], count, buf);
> >>> + req->actual += count;
> >>> + }
>
> >> Does it save much?
>
> > We do save some instruction and that's good to have.
>
> Wouldn't it be better to check for zero count inside
> musb_{read|write}_fifo()
> though?
>
> WBR, Sergei
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