Re: [PATCH wireless-next v2] wifi: mac80211: consider links for validating SCAN_FLAG_AP in scan request during MLO

[Johannes Berg <johannes@sipsolutions.net>]

On Tue, 2025-06-24 at 14:25 +0530, Aditya Kumar Singh wrote:
> Commit 78a7a126dc5b ("wifi: mac80211: validate SCAN_FLAG_AP in scan request
> during MLO") introduced a check that rejects scan requests if any link is
> already beaconing. This works fine when all links share the same radio, but
> breaks down in multi-radio setups.
> 
> Consider a scenario where a 2.4 GHz link is beaconing and a scan is
> requested on a 5 GHz link, each backed by a different physical radio. The
> current logic still blocks the scan, even though it should be allowed. As a
> result, interface bring-up fails unnecessarily in valid configurations.
> 
> Fix this by checking whether the scan is being requested on the same
> underlying radio as the beaconing link. Only reject the scan if it targets
> a link that is already beaconing and the SCAN_FLAG_AP is not set. This
> ensures correct behavior in multi-radio environments and avoids false
> rejections.
> 

This triggers a warning in ieee80211_is_radio_idx_in_scan_req() in hwsim
tests.

johannes