Baochen Qiang <quic_bqiang@xxxxxxxxxxx> wrote:
> We are seeing below warning:
> ...
> kernel: [ 5720.362941] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:197
> kernel: [ 5720.362943] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/4
> kernel: [ 5720.362947] CPU: 4 PID: 0 Comm: swapper/4 Tainted: G W 5.10.90 #18 4fa489e3e5c16043994f416310c2f60eff666320
> kernel: [ 5720.362949] Hardware name: Google Nipperkin/Nipperkin, BIOS Google_Nipperkin.14316.0.0 10/30/2021
> kernel: [ 5720.362950] Call Trace:
> kernel: [ 5720.362953] <IRQ>
> kernel: [ 5720.362959] dump_stack+0x9c/0xe7
> kernel: [ 5720.362964] ___might_sleep+0x14a/0x160
> kernel: [ 5720.362967] kmem_cache_alloc+0x46/0x226
> kernel: [ 5720.362970] ? __alloc_skb+0x6c/0x19e
> kernel: [ 5720.362972] __alloc_skb+0x6c/0x19e
> kernel: [ 5720.362985] cfg80211_gtk_rekey_notify+0xa2/0x21d [cfg80211 2c8b5aee0416e7d010d70c332a47990fc843c1c5]
> kernel: [ 5720.362995] ath11k_wmi_gtk_offload_status_event+0x102/0x155 [ath11k 4c6bb5f7331c81199d56a7e37bdc10030f167838]
> kernel: [ 5720.363002] ath11k_wmi_tlv_op_rx+0x301/0x51b [ath11k 4c6bb5f7331c81199d56a7e37bdc10030f167838]
> kernel: [ 5720.363009] ath11k_htc_rx_completion_handler+0xee/0x3f5 [ath11k 4c6bb5f7331c81199d56a7e37bdc10030f167838]
> kernel: [ 5720.363017] ath11k_ce_per_engine_service+0x2aa/0x32c [ath11k 4c6bb5f7331c81199d56a7e37bdc10030f167838]
> kernel: [ 5720.363024] ath11k_pci_ce_tasklet+0x1a/0x30 [ath11k_pci 9acc399855ea172aa14a892c0bfdba0ce22d6f07]
> kernel: [ 5720.363028] tasklet_action_common+0x8d/0x9f
> kernel: [ 5720.363032] __do_softirq+0x163/0x29a
> kernel: [ 5720.363035] asm_call_irq_on_stack+0x12/0x20
> kernel: [ 5720.363037] </IRQ>
> kernel: [ 5720.363041] do_softirq_own_stack+0x3c/0x48
> kernel: [ 5720.363043] __irq_exit_rcu+0x9b/0x9d
> kernel: [ 5720.363046] common_interrupt+0xc9/0x14d
> kernel: [ 5720.363049] asm_common_interrupt+0x1e/0x40
> kernel: [ 5720.363054] RIP: 0010:cpuidle_enter_state+0x1c5/0x2ac
> kernel: [ 5720.363056] Code: 84 f6 4c 8b 75 c0 74 1e 48 c7 45 c8 00 00 00 00 9c 8f 45 c8 0f ba 65 c8 09 0f 82 d1 00 00 00 31 ff e8 4a bb 6c ff fb 45 85 e4 <78> 47 44 89 e0 48 6b d0 68 49 8b 4c 16 48 48 2b 5d b8 49 89 5d 18
> kernel: [ 5720.363058] RSP: 0018:ffffa7e640157e78 EFLAGS: 00000206
> kernel: [ 5720.363060] RAX: ffff9807ddf29b40 RBX: 00000533e033584c RCX: 00000533e033584c
> kernel: [ 5720.363062] RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000000
> kernel: [ 5720.363063] RBP: ffffa7e640157ec0 R08: 0000000000000002 R09: 00000533e171bb7a
> kernel: [ 5720.363064] R10: 0000000000000900 R11: fffffffffffffffe R12: 0000000000000003
> kernel: [ 5720.363065] R13: ffff9804c2ef6000 R14: ffffffffbe9a7bd0 R15: 0000000000000003
> kernel: [ 5720.363069] ? cpuidle_enter_state+0x19a/0x2ac
> kernel: [ 5720.363072] cpuidle_enter+0x2e/0x3d
> kernel: [ 5720.363074] do_idle+0x163/0x1ee
> kernel: [ 5720.363076] cpu_startup_entry+0x1d/0x1f
> kernel: [ 5720.363078] secondary_startup_64_no_verify+0xb1/0xbb
> ...
>
> This is because GFP_KERNEL is used by ath11k_wmi_gtk_offload_status_event
> while in atomic context. Fix it by using GFP_ATOMIC instead.
>
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
>
> Fixes: a16d9b50cfba ("ath11k: support GTK rekey offload")
> Signed-off-by: Baochen Qiang <quic_bqiang@xxxxxxxxxxx>
> Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Patch applied to ath-next branch of ath.git, thanks.
eee645eccfc4 ath11k: Don't use GFP_KERNEL in atomic context
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220427120033.1046759-1-quic_bqiang@xxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
