On Monday 15 January 2007 5:54 pm, Nate Diller wrote:
> --- a/drivers/usb/gadget/inode.c 2007-01-12 14:42:29.000000000 -0800
> +++ b/drivers/usb/gadget/inode.c 2007-01-12 14:25:34.000000000 -0800
> @@ -559,35 +559,32 @@ static int ep_aio_cancel(struct kiocb *i
> return value;
> }
>
> -static ssize_t ep_aio_read_retry(struct kiocb *iocb)
> +static int ep_aio_read_retry(struct kiocb *iocb)
> {
> struct kiocb_priv *priv = iocb->private;
> - ssize_t len, total;
> - int i;
> + ssize_t total;
> + int i, err = 0;
>
> /* we "retry" to get the right mm context for this: */
>
> /* copy stuff into user buffers */
> total = priv->actual;
> - len = 0;
> for (i=0; i < priv->nr_segs; i++) {
> ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
>
> if (copy_to_user(priv->iv[i].iov_base, priv->buf, this)) {
> - if (len == 0)
> - len = -EFAULT;
> + err = -EFAULT;
Discarding the capability to report partial success, e.g. that the first N
bytes were properly transferred? I don't see any virtue in that change.
Quite the opposite in fact.
I think you're also expecting that if N bytes were requested, that's always
how many will be received. That's not true for packetized I/O such as USB
isochronous transfers ... where it's quite legit (and in some cases routine)
for the other end to send packets that are shorter than the maximum allowed.
Sending a zero length packet is not the same as sending no packet at all,
for another example.
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