Hi Andrzej, On Mon, Sep 21, 2015 at 03:34:01PM +0200, Andrzej Hajda wrote: > byte_offset is unsigned. > > The problem has been detected using proposed semantic patch > scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1]. > > [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576 > > Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> > --- > 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 c562205..c577f95 100644 > --- a/drivers/input/touchscreen/atmel_mxt_ts.c > +++ b/drivers/input/touchscreen/atmel_mxt_ts.c > @@ -1267,7 +1267,7 @@ 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) { I'd rather we kept the check as is: it documents the expected range even if one of the checks is always true. If you search the archives you'll find Linus has also pretty strong opinion about these checks actually being useful from documenting POV. > *(config_mem + byte_offset) = val; > } else { > dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n", > -- > 1.9.1 > Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
