> -----Original Message-----
> From: Guenter Roeck <groeck7@xxxxxxxxx> On Behalf Of Guenter Roeck
> Sent: Tuesday, April 25, 2023 10:09 PM
> To: Andi Shyti <andi.shyti@xxxxxxxxxx>; Delphine_CC_Chiu/WYHQ/Wiwynn
> <Delphine_CC_Chiu@xxxxxxxxxx>
> Cc: patrick@xxxxxxxxx; Jean Delvare <jdelvare@xxxxxxxx>; Rob Herring
> <robh+dt@xxxxxxxxxx>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@xxxxxxxxxx>; linux-i2c@xxxxxxxxxxxxxxx;
> linux-hwmon@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v1 2/2] hwmon: pmbus: Add ltc4286 driver
>
> Security Reminder: Please be aware that this email is sent by an external
> sender.
>
> On 4/25/23 06:45, Andi Shyti wrote:
> > Hi Delphine,
> >
> > On top of Guenter's comments,
> >
> > [...]
> >
> >> +config SENSORS_LTC4286
> >> + bool "Linear Technologies LTC4286"
> >> + help
> >> + If you say yes here you get hardware monitoring support for Linear
> >> + Technology LTC4286.
> >
> > could you add a couple of words more here?
> >
> > [...]
> >
> >> +static int ltc4286_probe(struct i2c_client *client,
> >> + const struct i2c_device_id *id) {
> >> + int ret;
> >> + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
> >> + struct device *dev = &client->dev;
> >> + struct pmbus_driver_info *info;
> >> + u32 rsense;
> >> +
> >> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID,
> block_buffer);
> >> + if (ret < 0) {
> >> + dev_err(&client->dev, "failed to read manufacturer
> >> + id\n");
> >
> > you can use dev_err_probe() here:
> >
> > return dev_err_probe(&client->dev, err, "failed to read
> > manufacturer id\n");
> >
> >> + return ret;
> >> + }
> >> +
> >> + /* Refer to ltc4286 datasheet page 20
> >> + * the default manufacturer id is LTC
> >> + */
> >> + if (ret != LTC4286_MFR_ID_SIZE ||
> >> + strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) {
> >> + dev_err(&client->dev, "unsupported manufacturer id\n");
> >> + return -ENODEV;
> >> + }
> >> +
> >> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL,
> block_buffer);
> >> + if (ret < 0) {
> >> + dev_err(&client->dev, "failed to read manufacturer
> model\n");
> >> + return ret;
> >> + }
> >
> > Is this read really needed?
> >
>
> It only makes sense if the returned string is actually validated.
> Otherwise no.
>
> Guenter
We will add comaprision here.
for (mid = ltc4286_id; mid->name[0]; mid++) {
if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
break;
}
