Re: [PATCH v2] wifi: ath12k: fix survey indexing across bands

["Nicolas Escande" <nico.escande@gmail.com>]

On Thu Jul 2, 2026 at 12:50 PM CEST, Matthew Leach wrote:
> When running 'iw dev wlan0 survey dump' the values for the channel busy
> time have the same sequence across bands. This is caused by indexing
> into the ath12k survey array using a band-local index rather than the
> global index passed by mac80211. This results in surveys for 5 GHz and 6
> GHz channels returning values from 2.4 GHz slots, making the survey
> unusable on those bands. Further, there are redundant survey slots for
> multi-radio/single-phy instances.
>
> Fix by moving the survey data into ath12k_hw so multiple radios under a
> single wiphy share one table, and index into it using the global
> mac80211 index. A new spinlock in ath12k_hw serialises access to the
> survey array, which is now shared across all radios under a single hw.
>
> Band busy-times Before this fix:
>
> 2.4 GHz: 9, 2, 2, 2, 4, 2, 10, 16, 4, 12, 5
> 5 GHz:   9, 2, 2, 2, 4, 2, 10, 16, 4, 12, 5
> 6 GHz:   9, 2, 2, 2, 4, 2, 10, 16, 4, 12, 5
>
> After this fix, times are independent:
>
> 2.4 GHz: 23, 5,  5,  12, 2,   12,  26,  5,   3,  1,  27
> 5 GHz:   30, 40, 29, 27, 118, 118, 112, 120, 11, 11, 11
> 6 GHz:   1,  0,  0,  0,  0,   0,   0,   0,   0,  0,  1
>
> Tested-on: wcn7850 hw2.0 PCI WLAN.IOE_HMT.1.1-00018-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1
>

Hello,

I see that this is supposed to work on single phy device, but could someone
do a proper test to ensure that it will work on QCN9274 split phy ?

I know this is a big ask, and usually I would do it, but I do not have a setup
with a new enough kernel running to test this right now.

Thanks

> Fixes: 4f242b1d6996 ("wifi: ath12k: support get_survey mac op for single wiphy")
> Signed-off-by: Matthew Leach <matthew.leach@collabora.com>