[U-Boot] [PATCH v3 082/108] spi: ich: Correct max-size bug in ich_spi_adjust_size()

[Bin Meng]

Hi Simon,

On Thu, Nov 21, 2019 at 9:50 PM Simon Glass <sjg at chromium.org> wrote:
>
> Hi Bin,
>
> On Tue, 19 Nov 2019 at 07:36, Bin Meng <bmeng.cn at gmail.com> wrote:
> >
> > Hi Simon,
> >
> > On Mon, Oct 21, 2019 at 11:40 AM Simon Glass <sjg at chromium.org> wrote:
> > >
> > > This incorrectly shortens read operations if there is a maximum write size
> > > but no maximum read size. Fix it.
> > >
> > > Signed-off-by: Simon Glass <sjg at chromium.org>
> > > ---
> > >
> > > Changes in v3: None
> > > Changes in v2: None
> > >
> > >  drivers/spi/ich.c | 8 +++++---
> > >  1 file changed, 5 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
> > > index 7f73f096ecb..b28f3423584 100644
> > > --- a/drivers/spi/ich.c
> > > +++ b/drivers/spi/ich.c
> > > @@ -424,9 +424,11 @@ static int ich_spi_adjust_size(struct spi_slave *slave, struct spi_mem_op *op)
> > >                 page_offset = do_div(aux, ICH_BOUNDARY);
> > >         }
> > >
> > > -       if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size) {
> > > -               op->data.nbytes = min(ICH_BOUNDARY - page_offset,
> > > -                                     slave->max_read_size);
> > > +       if (op->data.dir == SPI_MEM_DATA_IN) {
> > > +               if (slave->max_read_size) {
> > > +                       op->data.nbytes = min(ICH_BOUNDARY - page_offset,
> > > +                                             slave->max_read_size);
> > > +               }
> >
> > Isn't the changed one the same as the old codes?
>
> The old code fails if max_read_size is 0 but max_write_size is set. It
> forgets to take account of max_write_size in that case.
>

I still don't get this. Based on your description, it seems that your
logic works if we remove the } before the else if

>
> >
> > >         } else if (slave->max_write_size) {
> > >                 op->data.nbytes = min(ICH_BOUNDARY - page_offset,
> > >                                       slave->max_write_size);
> > > --
>

Regards,
Bin