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VI0P192MB3023.EURP192.PROD.OUTLOOK.COM X-Proofpoint-ORIG-GUID: 9reMAODPFf8DUQ1nm23mChp42vEJhoFe X-Authority-Analysis: v=2.4 cv=OJoXGyaB c=1 sm=1 tr=0 ts=6a476947 cx=c_pps a=IaeKFcn9ZG3utCv+WzsRNA==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=8gLI3H-aZtYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=tr3XZvuDWTETL0Uaxejn:22 a=WQ4YJ39tjzx_Hbm9pN5v:22 a=Iwk81yimAAAA:8 a=SRXSuGLfWM0F02F4zgYA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PqBb7rsBcpu_OT3Qf5tX:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAzMDA3MyBTYWx0ZWRfX2WNQ2TcMxdtN Bf4+7P85mnjrehNndzsLnvHqLGJzM9BjZpQHnHQ7MhxUM56HSNXZfO+qFcocTtrmUSif8v7YNo4 pUwlT8yEV8vdeqOb8wXjTIo2ls1V35zXjQ+G7hoCjxs9YNEblr8UjEPyYxyd1zy+j0Wu3IOWAKn ggovI2BbVYbh2IteTvy/RMU21hsow6Rr2fHFLaOoNhFBiU3SlV443YnSc2y5QvqxDItnNXdXuJd XZrG/qhD8T0UrgEEmJUwLXXKY6AxzUZzzRHIHu83lq+vmzr5R8NlpWKQfilFxuOU3b+xtWzOjKP K3o8rAHs9h/G29U0ZoiwUgzNL4OpKiJ8/w2s9A78nK6FFhdJtikSUdwDXH7IigqSiVPD7VDl3pE Q0VpA2fajPVbKx3U71tqUjjhgSPFMkR4ZYjdp0CHBZRG1k1pneLuGAL18vcgIlBNukPw52uN1jO TN87ze004yV/0IP9Slw== X-Proofpoint-GUID: 9reMAODPFf8DUQ1nm23mChp42vEJhoFe X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAzMDA3MyBTYWx0ZWRfXxyrAYDehqQ1h OCe8WpJAqmaMYwOaY+qwMoIqJRqW6B7adTSljJWhGNHIf/26fy37O/Bpmetss8spMhxmLQj0yo5 36gFfUtbcY1WpX+Z4Ng/WUDlOI51+0E= On Fri, Jul 03, 2026 at 03:10:23PM +0800, Baochen Qiang wrote: > > > On 7/3/2026 2:36 PM, Alexander Wilhelm wrote: > > On Fri, Jul 03, 2026 at 12:04:10PM +0800, Baochen Qiang wrote: > >> > >> > >> On 7/2/2026 8:06 PM, Alexander Wilhelm wrote: > >>> On Thu, Jul 02, 2026 at 05:56:01PM +0800, Baochen Qiang wrote: > >>>> > >>>> > >>>> On 7/2/2026 5:17 PM, Alexander Wilhelm wrote: > >>>>> On Thu, Jul 02, 2026 at 10:41:25AM +0200, Alexander Wilhelm wrote: > >>>>>> On Thu, Jul 02, 2026 at 04:12:00PM +0800, Baochen Qiang wrote: > >>>>>>> > >>>>>>> > >>>>>>> On 6/29/2026 3:55 PM, Alexander Wilhelm wrote: > >>>>>>>> The ath12k_dp_get_mac_addr function performs a simple memcpy from a > >>>>>>>> CPU-native data types into an u8 array. On a big-endian architecture, this > >>>>>>>> later results in a null‑pointer dereference. Convert the data to > >>>>>>> > >>>>>>> Alex, did you find a time to investigate the root cause of the null pointer? > >>>>> > >>>>> Hi Baochen, > >>>>> > >>>>> I am now running kernel v6.18.26, and it looks like the null-pointer issue is > >>>>> gone. I only see the following log messages: > >>>>> > >>>>> ath12k_pci 0001:01:00.0: failed to vdev 0 create peer for AP: -110 > >>>> > >>>> what is the actual mac addr reported from firmware in the PEER MAP event? My understanding > >>>> is that, without this patch (if we really need it) we get a wrong mac addr, then in > >>>> ath12k_dp_link_peer_map_event() we are more likely to fail the peer look up hence would > >>>> create a new peer and wakeup the waiting thread. But the log here clearly indicates that > >>>> the wait timeout, which does not make sense to me. > >> > >> I think I can understand the behavior here: even if wakeup happens, the waiter in > >> ath12k_wait_for_dp_link_peer_common() checks the map result by calling > >> ath12k_dp_link_peer_find_by_vdev_and_addr(). Since the mac addr of the newly created peer > >> does not match, check failed. Finally we get timeout. > >> > >>> > >>> I have now added the following debug output for `peer_map_ev` inside of > >>> `ath12k_dp_htt_htc_t2h_msg_handler`: > >>> > >>> /* DEBUG */ > >>> switch (type) { > >>> case HTT_T2H_MSG_TYPE_PEER_MAP: > >>> case HTT_T2H_MSG_TYPE_PEER_MAP2: > >>> case HTT_T2H_MSG_TYPE_PEER_MAP3: > >>> ath12k_err(ab, "[DEBUG]: resp->peer_map_ev.info: %08X\n", le32_to_cpu(resp->peer_map_ev.info)); > >>> ath12k_err(ab, "[DEBUG]: resp->peer_map_ev.mac_addr_l32: %08X\n", le32_to_cpu(resp->peer_map_ev.mac_addr_l32)); > >>> ath12k_err(ab, "[DEBUG]: resp->peer_map_ev.info1: %08X\n", le32_to_cpu(resp->peer_map_ev.info1)); > >>> ath12k_err(ab, "[DEBUG]: resp->peer_map_ev.info2: %08X\n", le32_to_cpu(resp->peer_map_ev.info2)); > >>> break; > >>> default: > >>> break; > >>> } > >>> > >>> Here is the result: > >>> > >>> ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info: 0002002B > >>> ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.mac_addr_l32: C921F004 > >>> ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info1: FFFF0EE0 > >>> ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info2: 000502F5 > >>> ath12k_pci 0001:01:00.0: failed to vdev 0 create peer for AP: -110 > >>> ath12k_pci 0001:01:00.0: failed to create vdev 04:f0:21:c9:e0:0e ret -110 > >>> ath12k_pci 0001:01:00.0: failed to assign chanctx for vif 04:f0:21:c9:e0:0e link id 0 link vif is already started > >>> ath12k_pci 0001:01:00.0: invalid vdev id in vdev delete resp ev 0 > >>> > >>> Let me know if you see anything suspicious or if you need additional debug > >>> information. > >> > >> I am not really sure about the final mac addr and vdev id passed to > >> ath12k_dp_link_peer_map_event(), so can you also add print below? > >> > >> diff --git a/drivers/net/wireless/ath/ath12k/dp_peer.c > >> b/drivers/net/wireless/ath/ath12k/dp_peer.c > >> index 47d009a0d61f..3e8201d536a5 100644 > >> --- a/drivers/net/wireless/ath/ath12k/dp_peer.c > >> +++ b/drivers/net/wireless/ath/ath12k/dp_peer.c > >> @@ -162,6 +162,9 @@ void ath12k_dp_link_peer_map_event(struct ath12k_base *ab, u8 vdev_id, > >> u16 peer_ > >> struct ath12k_dp *dp = ath12k_ab_to_dp(ab); > >> struct ath12k *ar; > >> > >> + pr_info("peer map event: vdev_id %u peer_id %u mac_addr %pM ast_hash %u hw_peer_id > >> %u\n", > >> + vdev_id, peer_id, mac_addr, ast_hash, hw_peer_id); > >> + > >> spin_lock_bh(&dp->dp_lock); > >> peer = ath12k_dp_link_peer_find_by_vdev_and_addr(dp, vdev_id, mac_addr); > >> if (!peer) { > > > > Sure, here is the output: > > > > ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info: 0002002B > > ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.mac_addr_l32: C921F004 > > ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info1: FFFF0EE0 > > ath12k_pci 0001:01:00.0: [DEBUG]: resp->peer_map_ev.info2: 000502F5 > > peer map event: vdev_id 0 peer_id 2 mac_addr d902298bM ast_hash 5 hw_peer_id 757 > > what is d902298bM? are you using Linux? seems %pM is not properly formatted in your > environment. Sory. I got a typo while copy-and-paste. Here's the output: peer map event: vdev_id 0 peer_id 2 mac_addr c9:21:f0:04:0e:e0 ast_hash 5 hw_peer_id 757 Best regards Alexander Wilhelm