Re: [PATCH v2 1/3] usb: typec: tipd: Don't read/write more bytes than required

From: Heikki Krogerus
Date: Wed Sep 15 2021 - 03:20:16 EST


On Tue, Sep 14, 2021 at 04:02:33PM +0200, Sven Peter wrote:
> tps6598x_block_read/write always read 65 bytes of data even when much
> less is required when I2C_FUNC_I2C is used. Reduce this to the correct
> number.
>
> Signed-off-by: Sven Peter <sven@xxxxxxxxxxxxx>

Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

> ---
> no changes for v2
>
> drivers/usb/typec/tipd/core.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 21b3ae25c76d..c18ec3785592 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -123,7 +123,7 @@ tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
> if (!tps->i2c_protocol)
> return regmap_raw_read(tps->regmap, reg, val, len);
>
> - ret = regmap_raw_read(tps->regmap, reg, data, sizeof(data));
> + ret = regmap_raw_read(tps->regmap, reg, data, len + 1);
> if (ret)
> return ret;
>
> @@ -145,7 +145,7 @@ static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
> data[0] = len;
> memcpy(&data[1], val, len);
>
> - return regmap_raw_write(tps->regmap, reg, data, sizeof(data));
> + return regmap_raw_write(tps->regmap, reg, data, len + 1);
> }
>
> static inline int tps6598x_read16(struct tps6598x *tps, u8 reg, u16 *val)
> --
> 2.25.1

thanks,

--
heikki