On Thu, Oct 10, 2019 at 10:28:04AM +0100, Srinivas Kandagatla wrote: > On 09/10/2019 17:35, Mark Brown wrote: > > On Wed, Oct 09, 2019 at 09:51:08AM +0100, Srinivas Kandagatla wrote: > > > +static const u8 wsa881x_reg_readable[WSA881X_CACHE_SIZE] = { > > > +static bool wsa881x_readable_register(struct device *dev, unsigned int reg) > > > +{ > > > + return wsa881x_reg_readable[reg]; > > There's no bounds check and that array size is not... > I converted this now to a proper switch statement as other drivers do. > > > +static struct regmap_config wsa881x_regmap_config = { > > > + .reg_bits = 32, > > > + .val_bits = 8, > > > + .cache_type = REGCACHE_RBTREE, > > > + .reg_defaults = wsa881x_defaults, > > > + .num_reg_defaults = ARRAY_SIZE(wsa881x_defaults), > > > + .max_register = WSA881X_MAX_REGISTER, > > ...what regmap has as max_register. Uusually you'd render as a > > switch statement (as you did for volatile) and let the compiler > > figure out a sensible way to do the lookup. > Sorry, I did not get your point here. > Are you saying that we can skip max_register in this regmap config ? > Then how would max_register in regmap be set? I'm saying that you appear to be relying on max_register to verify that you're not overflowing the array bounds but you max_register is not set to the same thing as the array size.
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