On 08/04/2016 04:00 AM, Jean Delvare wrote:
Hi Guenter, On Wed, 3 Aug 2016 22:15:37 -0700, Guenter Roeck wrote:Since commit 698a7c24a544 ("hwmon: (nct6775) Support two SuperIO chips in the same system"), the driver supports two Super-IO chips. This has the undesirable side effect that force_id always detects a second chip at address 0xfff8, even if no chip exists at that address. nct6775: Found NCT6793D or compatible chip at 0x4e:0xfff8 If no chip at all is found at a given SIO address, it does not make sense to instantiate it. Limit force_id to only work if some chip is found, that is if the chip ID returns a value other than 0xffff.Agreed, good catch.Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> --- drivers/hwmon/nct6775.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index d087a8e00cf5..7859a30ce31e 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -4232,11 +4232,11 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data) if (err) return err; - if (force_id) + val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) | + superio_inb(sioaddr, SIO_REG_DEVID + 1); + if (force_id && val != 0xffff) val = force_id; - else - val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) - | superio_inb(sioaddr, SIO_REG_DEVID + 1); + switch (val & SIO_ID_MASK) { case SIO_NCT6106_ID: sio_data->kind = nct6106;Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Thanks! Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
