| Message ID | 20240223054505.438839-1-quic_kangyang@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | wifi: ath12k: add rcu lock for ath12k_wmi_p2p_noa_event() | expand |
On 2/22/2024 9:45 PM, Kang Yang wrote: > Warning will appear when running P2P GO: > > WARNING: suspicious RCU usage > drivers/net/wireless/ath/ath12k/mac.c:583 suspicious rcu_dereference_check() usage! > other info that might help us debug this: > rcu_scheduler_active = 2, debug_locks = 1 > no locks held by swapper/0/0. > stack backtrace: > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc4-wt-ath+ #4 > Call Trace: > <IRQ> > dump_stack_lvl+0x82/0xa0 > dump_stack+0x14/0x20 > lockdep_rcu_suspicious+0x214/0x3b0 > ath12k_mac_get_ar_by_vdev_id+0x192/0x220 [ath12k] > ath12k_wmi_op_rx+0x2d7/0x1b40 [ath12k] > > ath12k_mac_get_ar_by_vdev_id() requires its callers to have called > rcu_read_lock(), but in ath12k_wmi_p2p_noa_event() it is called without > doing so, and hence the warning was triggered. > > Add rcu_read_lock() and rcu_read_unlock() to avoid warning. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 > > Fixes: 9411eecb60cb ("wifi: ath12k: implement handling of P2P NoA event") > Reported-by: Kalle Valo <quic_kvalo@quicinc.com> > Closes: https://lore.kernel.org/linux-wireless/87o7cusyvw.fsf@kernel.org/ > Signed-off-by: Kang Yang <quic_kangyang@quicinc.com> Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Kang Yang <quic_kangyang@quicinc.com> wrote: > Warning will appear when running P2P GO: > > WARNING: suspicious RCU usage > drivers/net/wireless/ath/ath12k/mac.c:583 suspicious rcu_dereference_check() usage! > other info that might help us debug this: > rcu_scheduler_active = 2, debug_locks = 1 > no locks held by swapper/0/0. > stack backtrace: > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc4-wt-ath+ #4 > Call Trace: > <IRQ> > dump_stack_lvl+0x82/0xa0 > dump_stack+0x14/0x20 > lockdep_rcu_suspicious+0x214/0x3b0 > ath12k_mac_get_ar_by_vdev_id+0x192/0x220 [ath12k] > ath12k_wmi_op_rx+0x2d7/0x1b40 [ath12k] > > ath12k_mac_get_ar_by_vdev_id() requires its callers to have called > rcu_read_lock(), but in ath12k_wmi_p2p_noa_event() it is called without > doing so, and hence the warning was triggered. > > Add rcu_read_lock() and rcu_read_unlock() to avoid warning. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 > > Fixes: 9411eecb60cb ("wifi: ath12k: implement handling of P2P NoA event") > Reported-by: Kalle Valo <quic_kvalo@quicinc.com> > Closes: https://lore.kernel.org/linux-wireless/87o7cusyvw.fsf@kernel.org/ > Signed-off-by: Kang Yang <quic_kangyang@quicinc.com> > Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. ee3b63586b30 wifi: ath12k: add rcu lock for ath12k_wmi_p2p_noa_event()
diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c index 838161dd9098..9d69a1769926 100644 --- a/drivers/net/wireless/ath/ath12k/wmi.c +++ b/drivers/net/wireless/ath/ath12k/wmi.c @@ -6736,18 +6736,21 @@ static int ath12k_wmi_p2p_noa_event(struct ath12k_base *ab, "wmi tlv p2p noa vdev_id %i descriptors %u\n", vdev_id, le32_get_bits(noa->noa_attr, WMI_P2P_NOA_INFO_DESC_NUM)); + rcu_read_lock(); ar = ath12k_mac_get_ar_by_vdev_id(ab, vdev_id); if (!ar) { ath12k_warn(ab, "invalid vdev id %d in P2P NoA event\n", vdev_id); ret = -EINVAL; - goto out; + goto unlock; } ath12k_p2p_noa_update_by_vdev_id(ar, vdev_id, noa); ret = 0; +unlock: + rcu_read_unlock(); out: kfree(tb); return ret;
Warning will appear when running P2P GO: WARNING: suspicious RCU usage drivers/net/wireless/ath/ath12k/mac.c:583 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by swapper/0/0. stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc4-wt-ath+ #4 Call Trace: <IRQ> dump_stack_lvl+0x82/0xa0 dump_stack+0x14/0x20 lockdep_rcu_suspicious+0x214/0x3b0 ath12k_mac_get_ar_by_vdev_id+0x192/0x220 [ath12k] ath12k_wmi_op_rx+0x2d7/0x1b40 [ath12k] ath12k_mac_get_ar_by_vdev_id() requires its callers to have called rcu_read_lock(), but in ath12k_wmi_p2p_noa_event() it is called without doing so, and hence the warning was triggered. Add rcu_read_lock() and rcu_read_unlock() to avoid warning. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Fixes: 9411eecb60cb ("wifi: ath12k: implement handling of P2P NoA event") Reported-by: Kalle Valo <quic_kvalo@quicinc.com> Closes: https://lore.kernel.org/linux-wireless/87o7cusyvw.fsf@kernel.org/ Signed-off-by: Kang Yang <quic_kangyang@quicinc.com> --- drivers/net/wireless/ath/ath12k/wmi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) base-commit: 707e306f3573fa321ae197d77366578e4566cff5