Re: [PATCH 1/1] hwmon: (nct6775) Additional check for ChipID before ASUS WMI usage

[Guenter Roeck]

On 12/18/21 11:26 AM, Denis Pauk wrote:
> WMI monitoring methods can be changed or removed in new ASUS boards
> BIOS versions. Such versions return zero instead of a real one as
> Chip ID.
>
> Commit adds additional validation for the result of Chip ID call
> before enabling access by ASUS WMI methods.
>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
> Signed-off-by: Denis Pauk <pauk.denis@xxxxxxxxx>
> ---
>   drivers/hwmon/nct6775.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
> index 57ce8633a725..034347ed51c4 100644
> --- a/drivers/hwmon/nct6775.c
> +++ b/drivers/hwmon/nct6775.c
> @@ -5038,7 +5038,8 @@ static int __init sensors_nct6775_init(void)
>   				   board_name);
>   		if (err >= 0) {
>   			/* if reading chip id via WMI succeeds, use WMI */
> -			if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp)) {
> +			if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) &&
> +			    tmp) {

Please drop the continuation line; the above hurts readability, and in that case
up to 100 columns are allowed.

Thanks,
Guenter

>   				pr_info("Using Asus WMI to access %#x chip.\n", tmp);
>   				access = access_asuswmi;
>   			} else {
>
> base-commit: 2585cf9dfaaddf00b069673f27bb3f8530e2039c