On Sun, Oct 08, 2017 at 08:41:16PM +0100, Nick Dyer wrote:
> On Sun, Oct 08, 2017 at 07:44:18PM +0100, Christos Gkekas wrote:
> > Variable byte_offset is unsigned so checking whether it is greater or
> > equal to zero is redundant.
> >
> > Signed-off-by: Christos Gkekas <chris.gekas@xxxxxxxxx>
>
> Yep - looks sensible to me.
>
> Signed-off-by: Nick Dyer <nick@xxxxxxxxxxxxx>
I believe this has been discussed before and Linus told us to keep the
such checks as is: they neatly document the ranges of values, safe in
case we ever change the type of the variables, and do not cost us
anything at execution time.
>
> > ---
> > drivers/input/touchscreen/atmel_mxt_ts.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> > index 7659bc4..baafaed 100644
> > --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> > +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> > @@ -1356,7 +1356,7 @@ static int mxt_prepare_cfg_mem(struct mxt_data *data,
> >
> > byte_offset = reg + i - cfg_start_ofs;
> >
> > - if (byte_offset >= 0 && byte_offset < config_mem_size) {
> > + if (byte_offset < config_mem_size) {
> > *(config_mem + byte_offset) = val;
> > } else {
> > dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
> > --
> > 2.7.4
> >
Thanks.
--
Dmitry
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