On 10/2/19 5:46 PM, Peter Oh wrote: >On 10/2/19 6:59 AM, Aaron Komisar wrote: >> In non-ETSI reg domains scan is blocked when operating channel is a DFS ch. >> For ETSI domains, however, once DFS channel is marked as available afer >> the CAC, this channel will remain available even after leaving this channel. >> Therefore a new CAC will not be required when scan is done. >> >> In cfg80211 scan is not blocked for ETSI reg domains. >> This patch enables scan in mac80211 as well when operating channel is a radar >> channel for ETSI reg domains (unless CAC is in progress). >> >This is not the right approach to solve the problem. > >The real reason of scan failure is because mac80211 checks if it's DFS >channel, but it doesn't check if CAC is done or not. The problem is that scan request is blocked in ETSI reg domains. In non-ETSI reg domains the behavior is fine. cfg80211 blocks scan in non-ETSI reg domains and allows leaving the channel in ETSI reg domains. I think that if we add a function in mac80211, which checks if we can leave the operating channel this function should also take into account the reg domain for completeness. > >So to solve the issue, the right approach should be "check if DFS >channels and check if CAC is done". We can't scan while CAC is in progress but why must we verify that CAC was done in order to perform a scan operation? > >You may refer how "cfg80211_reg_can_beacon()" is doing for that. > > >Thanks, > >Peter Thanks, Aaron
