Re: [PATCH for-current] wifi: ath12k: fix handling of 6 GHz rules

[Jeff Johnson <jeff.johnson@oss.qualcomm.com>]

On 1/23/2025 8:21 AM, Aditya Kumar Singh wrote:
> In the US country code, to avoid including 6 GHz rules in the 5 GHz rules
> list, the number of 5 GHz rules is set to a default constant value of 4
> (REG_US_5G_NUM_REG_RULES). However, if there are more than 4 valid 5 GHz
> rules, the current logic will bypass the legitimate 6 GHz rules.
> 
> For example, if there are 5 valid 5 GHz rules and 1 valid 6 GHz rule, the
> current logic will only consider 4 of the 5 GHz rules, treating the last
> valid rule as a 6 GHz rule. Consequently, the actual 6 GHz rule is never
> processed, leading to the eventual disabling of 6 GHz channels.
> 
> To fix this issue, instead of hardcoding the value to 4, use a helper
> function to determine the number of 6 GHz rules present in the 5 GHz rules
> list and ignore only those rules.
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
> 
> Cc: stable@vger.kernel.org

Note that an upcoming linux-firmware PR will bring in firmware that triggers
this issue, so want to get all affected versions of the driver patched before
issuing that PR.

/jeff