+cc Oleskandr who kindly pointed me at the v1 of this patch (see [0]). [0]:https://lore.kernel.org/all/20250124093352.481-1-quic_lingbok@xxxxxxxxxxx/ On Wed, Feb 26, 2025 at 07:31:18PM +0800, Lingbo Kong wrote: > Currently, when ath12k performs the remove link interface operation, if > there is an ongoing scan operation on the arvif, ath12k may execute the > remove link interface operation multiple times on the same arvif. This > occurs because, during the remove link operation, if a scan operation is > present on the arvif, ath12k may receive a WMI_SCAN_EVENT_COMPLETED event > from the firmware. Upon receiving this event, ath12k will continue to > execute the ath12k_scan_vdev_clean_work() function, performing the remove > link interface operation on the same arvif again. > > To address this issue, before executing the remove link interface > operation, ath12k needs to check if there is an ongoing scan operation on > the current arvif. If such an operation exists, it should be aborted. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 > > Signed-off-by: Lingbo Kong <quic_lingbok@xxxxxxxxxxx> Hey, thanks for this! Not sure on status of this, has the patch been taken for 6.15? As I don't see it in Linus's tree (not looking _that_ hard though). I don't think it's even in -next? I keep hitting issues with my X870E CARBON wifi onboard motherboard wifi - most recently I saw a null pointer deref in ath12k_mac_remove_link_interface(). This occurred when I tried changing the network interface, in fact I had first clicked on 'available networks' in network manager so quite likely a concurrent scan. I rather stupidly didn't copy/paste the text of it, but you can see the report in screenshot form at [1]. Apologies for shade being case on ath12k driver but you know, frustrations :)) It's difficult for me to test your patch as I am having pretty awful firmware issue with this motherboard - if I powercycle in any way that gets interrupted, or especially if a kernel issue arises, then the ath12k module will not load on next boot, or at all going forward. Updating the kernel to, I think, a recent 6.13 (and now 6.14-1 where I observed this issue), got the wifi working again, seemingly randomly. Usually I have to try to reset the CMOS state, but doing so causes other issues so I generally try to avoid (I have a network workaround involving an ethernet wifi adapater, it's pretty... yeah). So I assume some non-volatile state gets corrupted somehow, I'm not sure if you had any insights into how I might more sanely reset that? Anyway regardless thanks for your efforts, if the wifi adapter appears again then I will test this and can give T-b tags if so. Cheers, Lorenzo [1]:https://fosstodon.org/@ljs/114318530969496869 > --- > 1.rebase to ath-next > > drivers/net/wireless/ath/ath12k/mac.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c > index 3e3afdc56fc9..551133483f44 100644 > --- a/drivers/net/wireless/ath/ath12k/mac.c > +++ b/drivers/net/wireless/ath/ath12k/mac.c > @@ -9578,6 +9578,11 @@ ath12k_mac_op_unassign_vif_chanctx(struct ieee80211_hw *hw, > if (ahvif->vdev_type != WMI_VDEV_TYPE_MONITOR && > ar->num_started_vdevs == 1 && ar->monitor_vdev_created) > ath12k_mac_monitor_stop(ar); > + > + if (ar->scan.arvif == arvif && ar->scan.state == ATH12K_SCAN_RUNNING) { > + ath12k_scan_abort(ar); > + ar->scan.arvif = NULL; > + } > } > > static int > > base-commit: e180a01bf2c4a67db13d70d2d91410a8c6f74be3 > -- > 2.34.1 > >
