[PATCH 2/2] ath10k: Don't iterate over not-sdata-in-driver interfaces.
greearb at candelatech.com
greearb at candelatech.com
Tue Sep 22 15:19:57 EDT 2020
From: Ben Greear <greearb at candelatech.com>
This fixes possible crash scenario where interfaces that were not
set up in the driver yet might still be iterated over. When originally
debugged on the ath10k-ct driver, the crash looked like this:
kernel BUG at /home/greearb/git/linux-4.7.dev.y/drivers/net/wireless/ath/ath10k/wmi.c:1781!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in: nf_conntrack_netlink nf_conntrack nfnetlink nf_defrag_ipv4 bridge carl9170 mac80211_hwsim ath10k_pci ath10k_core ath5k ath9k ath9k_common ath9k_hw ath mac80211 cfg80211 8021q garp mrp stp llc bnep bluetooth fuse macvlan pktgen rpcsec_gss_krb5 nfsv4 nfs fscache snd_hda_codec_hdmi coretemp hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek snd_hda_codec_generic kvm iTCO_wdt irqbypass iTCO_vendor_support joydev snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device pcspkr snd_pcm snd_timer shpchp snd i2c_i801 lpc_ich soundcore tpm_tis tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc i915 serio_raw i2c_algo_bit drm_kms_helper ata_generic e1000e pata_acpi drm ptp pps_core i2c_core fjes video ipv6 [last unloaded: nf_conntrack]
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.7.10+ #15
Hardware name: To be filled by O.E.M. To be filled by O.E.M./ChiefRiver, BIOS 4.6.5 06/07/2013
task: ffff8801d4f20000 ti: ffff8801d4f28000 task.ti: ffff8801d4f28000
RIP: 0010:[<ffffffffa0efbcfb>] [<ffffffffa0efbcfb>] ath10k_wmi_tx_beacons_iter+0x28b/0x290 [ath10k_core]
RSP: 0018:ffff8801d6447a98 EFLAGS: 00010293
RAX: 0000000000000018 RBX: ffff8801ce97e1d8 RCX: 0000000000000000
RDX: 0000000000000018 RSI: 0000000000000003 RDI: ffffed003ac88f49
RBP: ffff8801d6447af0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801ce97e320 R14: ffff8801ce97e378 R15: ffff8801ce97ca40
FS: 0000000000000000(0000) GS:ffff8801d6440000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007eff191ef1ab CR3: 000000000260a000 CR4: 00000000001406e0
Stack:
1ffff1003ac88f59 0000000041b58ab3 ffffffffa0f4d52a ffff8801d4f20000
0000000000000246 0000000000000002 ffff8801ce97e1d8 ffff8801bd5d39b8
0000000000000002 0000000000000001 ffff8801ce97ca40 ffff8801d6447b48
Call Trace:
<IRQ>
[<ffffffffa0d03e5c>] __iterate_interfaces+0xfc/0x1d0 [mac80211]
[<ffffffffa0efba70>] ? ath10k_wmi_cmd_send_nowait+0x260/0x260 [ath10k_core]
[<ffffffffa0efba70>] ? ath10k_wmi_cmd_send_nowait+0x260/0x260 [ath10k_core]
[<ffffffffa0d04477>] ieee80211_iterate_active_interfaces_atomic+0x67/0x100 [mac80211]
[<ffffffffa0d04410>] ? ieee80211_handle_reconfig_failure+0x140/0x140 [mac80211]
[<ffffffffa0ef4060>] ? ath10k_tpc_config_disp_tables+0x620/0x620 [ath10k_core]
[<ffffffffa0ef408b>] ath10k_wmi_op_ep_tx_credits+0x2b/0x50 [ath10k_core]
[<ffffffffa0ee2fd2>] ath10k_htc_rx_completion_handler+0x422/0x5c0 [ath10k_core]
[<ffffffffa0b4301e>] ath10k_pci_process_rx_cb+0x37e/0x430 [ath10k_pci]
[<ffffffffa0ee2bb0>] ? ath10k_htc_build_tx_ctrl_skb+0xc0/0xc0 [ath10k_core]
[<ffffffffa0b42ca0>] ? ath10k_pci_rx_post_pipe+0x550/0x550 [ath10k_pci]
[<ffffffff8120cbe5>] ? debug_lockdep_rcu_enabled+0x35/0x40
[<ffffffff811e1893>] ? mark_held_locks+0x23/0xc0
[<ffffffff8116019a>] ? __local_bh_enable_ip+0x6a/0xd0
[<ffffffff811e1abb>] ? trace_hardirqs_on_caller+0x18b/0x290
[<ffffffff811e1bcd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff8116019a>] ? __local_bh_enable_ip+0x6a/0xd0
[<ffffffff81df11d0>] ? _raw_spin_unlock_bh+0x30/0x40
[<ffffffffa0b4902e>] ? ath10k_ce_per_engine_service+0xee/0x100 [ath10k_pci]
[<ffffffffa0b43139>] ath10k_pci_htt_htc_rx_cb+0x29/0x30 [ath10k_pci]
[<ffffffffa0b48fe6>] ath10k_ce_per_engine_service+0xa6/0x100 [ath10k_pci]
[<ffffffffa0b49116>] ath10k_ce_per_engine_service_any+0xd6/0xf0 [ath10k_pci]
[<ffffffffa0b45800>] ? ath10k_pci_enable_legacy_irq+0xe0/0xe0 [ath10k_pci]
[<ffffffffa0b4585f>] ath10k_pci_tasklet+0x5f/0xb0 [ath10k_pci]
[<ffffffff81160445>] tasklet_action+0x245/0x2b0
[<ffffffff81df4831>] __do_softirq+0x181/0x595
[<ffffffff8116137c>] irq_exit+0xbc/0xc0
[<ffffffff81df423c>] do_IRQ+0x7c/0x150
[<ffffffff81df23cc>] common_interrupt+0x8c/0x8c
<EOI>
[<ffffffff811e1abb>] ? trace_hardirqs_on_caller+0x18b/0x290
[<ffffffff81b722ae>] ? cpuidle_enter_state+0x1ae/0x4b0
[<ffffffff81b722a7>] ? cpuidle_enter_state+0x1a7/0x4b0
[<ffffffff81b72602>] cpuidle_enter+0x12/0x20
[<ffffffff811d0b6e>] call_cpuidle+0x4e/0x90
[<ffffffff811d10e7>] cpu_startup_entry+0x3f7/0x540
[<ffffffff811d0cf0>] ? default_idle_call+0x50/0x50
[<ffffffff81234bdf>] ? clockevents_config_and_register+0x5f/0x70
[<ffffffff81085a9a>] ? setup_APIC_timer+0xfa/0x110
[<ffffffff81083b63>] start_secondary+0x253/0x2b0
[<ffffffff81083910>] ? set_cpu_sibling_map+0x920/0x920
Code: 4d 49 e0 8b b3 48 01 00 00 48 c7 c7 a0 ee f3 a0 e8 d9 c2 3f e0 49 81 fd 3f 1f 00 00 76 0f 49 81 fc 3f 1f 00 00 0f 87 c0 fd ff ff <0f> 0b 0f 0b 90 55 48 89 e5 41 57 41 56 48 8d 85 58 ff ff ff 41
RIP [<ffffffffa0efbcfb>] ath10k_wmi_tx_beacons_iter+0x28b/0x290 [ath10k_core]
RSP <ffff8801d6447a98>
---[ end trace 6588464714e5163a ]---
Similar logic was tested for years in ath10k-ct driver and various firmware.
Also tested with stock kernel plus this patch, with firmware
10.2.4-1.0-00037
This test case was to bring up 5 vap on a radio and fake a firmware
crash. Make sure ap interfaces continue to function properly.
Signed-off-by: Ben Greear <greearb at candelatech.com>
---
drivers/net/wireless/ath/ath10k/core.h | 4 ++++
drivers/net/wireless/ath/ath10k/mac.c | 16 +++++++---------
drivers/net/wireless/ath/ath10k/p2p.c | 2 +-
drivers/net/wireless/ath/ath10k/wmi.c | 2 +-
4 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 5c18f6c204628..1d89aae6a21cb 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -82,6 +82,10 @@
/* Default Airtime weight multipler (Tuned for multiclient performance) */
#define ATH10K_AIRTIME_WEIGHT_MULTIPLIER 4
+
+#define ITER_NORMAL_FLAGS (IEEE80211_IFACE_ITER_NORMAL | IEEE80211_IFACE_SKIP_SDATA_NOT_IN_DRIVER)
+#define ITER_RESUME_FLAGS (IEEE80211_IFACE_ITER_RESUME_ALL | IEEE80211_IFACE_SKIP_SDATA_NOT_IN_DRIVER)
+
struct ath10k;
static inline const char *ath10k_bus_str(enum ath10k_bus bus)
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 3c0c33a9f30cb..f4391f71efb8b 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2066,7 +2066,7 @@ static void ath10k_mac_handle_beacon_iter(void *data, u8 *mac,
void ath10k_mac_handle_beacon(struct ath10k *ar, struct sk_buff *skb)
{
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_mac_handle_beacon_iter,
skb);
}
@@ -2099,7 +2099,7 @@ static void ath10k_mac_handle_beacon_miss_iter(void *data, u8 *mac,
void ath10k_mac_handle_beacon_miss(struct ath10k *ar, u32 vdev_id)
{
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_mac_handle_beacon_miss_iter,
&vdev_id);
}
@@ -3367,7 +3367,7 @@ void ath10k_mac_tx_unlock(struct ath10k *ar, int reason)
return;
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_RESUME_ALL,
+ ITER_RESUME_FLAGS,
ath10k_mac_tx_unlock_iter,
ar);
@@ -3456,7 +3456,7 @@ void ath10k_mac_handle_tx_pause_vdev(struct ath10k *ar, u32 vdev_id,
spin_lock_bh(&ar->htt.tx_lock);
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_RESUME_ALL,
+ ITER_RESUME_FLAGS,
ath10k_mac_handle_tx_pause_iter,
&arg);
spin_unlock_bh(&ar->htt.tx_lock);
@@ -8119,7 +8119,7 @@ ath10k_mac_op_change_chanctx(struct ieee80211_hw *hw,
if (changed & IEEE80211_CHANCTX_CHANGE_WIDTH) {
ieee80211_iterate_active_interfaces_atomic(
hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_mac_change_chanctx_cnt_iter,
&arg);
if (arg.n_vifs == 0)
@@ -8132,7 +8132,7 @@ ath10k_mac_op_change_chanctx(struct ieee80211_hw *hw,
ieee80211_iterate_active_interfaces_atomic(
hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_mac_change_chanctx_fill_iter,
&arg);
ath10k_mac_update_vif_chan(ar, arg.vifs, arg.n_vifs);
@@ -8928,14 +8928,12 @@ static void ath10k_get_arvif_iter(void *data, u8 *mac,
struct ath10k_vif *ath10k_get_arvif(struct ath10k *ar, u32 vdev_id)
{
struct ath10k_vif_iter arvif_iter;
- u32 flags;
memset(&arvif_iter, 0, sizeof(struct ath10k_vif_iter));
arvif_iter.vdev_id = vdev_id;
- flags = IEEE80211_IFACE_ITER_RESUME_ALL;
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- flags,
+ ITER_RESUME_FLAGS,
ath10k_get_arvif_iter,
&arvif_iter);
if (!arvif_iter.arvif) {
diff --git a/drivers/net/wireless/ath/ath10k/p2p.c b/drivers/net/wireless/ath/ath10k/p2p.c
index 29c737b2f4327..6252ffd275239 100644
--- a/drivers/net/wireless/ath/ath10k/p2p.c
+++ b/drivers/net/wireless/ath/ath10k/p2p.c
@@ -139,7 +139,7 @@ void ath10k_p2p_noa_update_by_vdev_id(struct ath10k *ar, u32 vdev_id,
};
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_p2p_noa_update_vdev_iter,
&arg);
}
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index a81a1ab2de19e..5c5f7fd542b64 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -1893,7 +1893,7 @@ static void ath10k_wmi_tx_beacons_iter(void *data, u8 *mac,
static void ath10k_wmi_tx_beacons_nowait(struct ath10k *ar)
{
ieee80211_iterate_active_interfaces_atomic(ar->hw,
- IEEE80211_IFACE_ITER_NORMAL,
+ ITER_NORMAL_FLAGS,
ath10k_wmi_tx_beacons_iter,
NULL);
}
--
2.26.2
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