On Sun, 2015-01-18 at 23:14 +0100, Arend van Spriel wrote: > On 01/18/15 21:18, Emmanuel Grumbach wrote: > > When we have an active scheduled scan, and the RFKILL > > interrupt kicks in, the stack will cancel the scheduled > > scan as part of the down flow. But cancelling scheduled > > scan usually implies sending a command to the firwmare > > which has been killed as part of the RFKILL interrupt > > handling. > > Because of that, we returned an error to mac80211 when > > it asked to stop the scheduled scan and didn't notify the > > end of the scheduled scan. Besides a fat warning, this led > > to a situation in which cfg80211 would refuse any new scan > > request. > > > > To disentangle this, fake that the scheduled scan has been > > stopped without sending the command to the firwmare, return > > 0 after having properly let cfg80211 know that the scan > > has been cancelled. > > > > This is basically the same as: > > commit 9b520d84957d63348e87c0f2cbd21d86e1e8f2f2 > > Author: Emmanuel Grumbach<[email protected]> > > Date: Tue Nov 4 15:54:11 2014 +0200 > > > > iwlwifi: mvm: abort scan upon RFKILL > > > > This code existed but not for all the different FW APIs > > we support. > > Fix this. > > > > but for the scheduled scan case. > > So looking at the patch I guess cfg80211 will still issues a WARN_ON, right? >
Why? cfg80211 gets notified about the scan completion, so no scanning should remain active when the down flow is over. > > Link: http://permalink.gmane.org/gmane.linux.kernel.wireless.general/133232 > > Reported-by: Linus Torvalds<[email protected]> > > Signed-off-by: Emmanuel Grumbach<[email protected]> > > --- > > drivers/net/wireless/iwlwifi/mvm/scan.c | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c > > b/drivers/net/wireless/iwlwifi/mvm/scan.c > > index 3fbba4b..844bf7c 100644 > > --- a/drivers/net/wireless/iwlwifi/mvm/scan.c > > +++ b/drivers/net/wireless/iwlwifi/mvm/scan.c > > @@ -1107,6 +1107,12 @@ int iwl_mvm_scan_offload_stop(struct iwl_mvm *mvm, > > bool notify) > > return iwl_umac_scan_stop(mvm, IWL_UMAC_SCAN_UID_SCHED_SCAN, > > notify); > > > > + if (mvm->scan_status == IWL_MVM_SCAN_NONE) > > + return 0; > > + > > + if (iwl_mvm_is_radio_killed(mvm)) > > + goto out; > > + > > if (mvm->scan_status != IWL_MVM_SCAN_SCHED&& > > (!(mvm->fw->ucode_capa.api[0]& IWL_UCODE_TLV_API_LMAC_SCAN) || > > mvm->scan_status != IWL_MVM_SCAN_OS)) { > > @@ -1143,6 +1149,7 @@ int iwl_mvm_scan_offload_stop(struct iwl_mvm *mvm, > > bool notify) > > if (mvm->scan_status == IWL_MVM_SCAN_OS) > > iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN); > > > > +out: > > mvm->scan_status = IWL_MVM_SCAN_NONE; > > > > if (notify) { >
