On Wed, Feb 04, 2015 at 01:40:25AM -0800, Nicholas A. Bellinger wrote:
> > > + /*
> > > + * Any associated T10_PI bytes for the outgoing / incoming
> > > + * payloads are included in calculation of exp_data_len here.
> > > + */
> > > + if (out_size > req_size) {
> > > + data_direction = DMA_TO_DEVICE;
> > > + exp_data_len = out_size - req_size;
> > > + } else if (in_size > rsp_size) {
> > > + data_direction = DMA_FROM_DEVICE;
> > > + exp_data_len = in_size - rsp_size;
> > > + } else {
> > > + data_direction = DMA_NONE;
> > > + exp_data_len = 0;
> > > + }
> >
> > We must validate this doesn't cause exp_data_len to be negative.
> >
>
> AFAICT, exp_data_len is always >= 0 here.
What guarantees out_size > req_size and in_size > rsp_size,
respectively?
--
MST
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