[PATCH AUTOSEL 5.6 078/149] ath11k: fix warn-on in disassociation

Sasha Levin
2020-04-11T23:05:30Z

From: Karthikeyan Periyasamy <periyasa@codeaurora.org>

[ Upstream commit 79c080dbe35baaa1d46b241047a9dde745fc12eb ]

In multi AP VAP scenario, when user bring down the interfaces. mac80211 mark
the interface down for the duplicated VAP and removed from the
local->interfaces list. ath11k_mac_get_arvif() is dependent on
ieee80211_iterate_active_interfaces_atomic() API to find the vdev id
in a given radio. In disassociation path, ath11k_mac_get_arvif() not
able to find the given vdev id since that VAP is removed from the
local->interfaces list. since sta_state callback throws error, mac80211 log
the below WARN_ON_ONCE message.

Fixed it by storing the allocated_vdev_map in each radio structure to maintain
the created vdev id bits. so that we can directly mask this against the given
vdev_id to find out the ar from the vdev_id.

WARN LOG:

WARNING: at net/mac80211/sta_info.c:1008
CPU: 2 PID: 2135 Comm: hostapd Not tainted #1
Hardware name: Qualcomm Technologies, Inc. IPQ807x/AP-HK01-C1 (DT)
task: ffffffc03a43d800 ti: ffffffc03a43d800 task.ti: ffffffc03a43d800
PC is at sta_set_sinfo+0x9dc/0xad4 [mac80211]
LR is at sta_set_sinfo+0x9cc/0xad4 [mac80211]
pc : [<ffffffbffce2a008>] lr : [<ffffffbffce29ff8>] pstate: 20000145
sp : ffffffc02cedb5f0
x29: ffffffc02cedb5f0 x28: ffffffc03a43d800
x27: 0000000000000014 x26: 0000000000000001
x25: ffffffc02cfc4000 x24: ffffffc036905508
x23: 0000000000000012 x22: ffffffc02cedb670
x21: ffffffc03bc64880 x20: ffffffc036904f80
x19: ffffffc02ae31000 x18: 00000000b019f3a1
x17: 0000000057f30331 x16: 00000000d8d1998e
x15: 0000000000000066 x14: 393a35383a36343a
x13: 6337203a6e6f6974 x12: 6174732065746169
x11: 636f737361736964 x10: 206f742064656c69
x9 : 6146203a31696669 x8 : 6337203a6e6f6974
x7 : 6174732065746169 x6 : ffffffc0008c33f6
x5 : 0000000000000000 x4 : 0000000000000000
x3 : 0000000000000000 x2 : 00000000ffffff92
x1 : 0000000000000000 x0 : ffffffbffcea1091
---[ end trace 63c4b1c527345d5a ]---
Call trace:
[<ffffffbffce2a008>] sta_set_sinfo+0x9dc/0xad4 [mac80211]
[<ffffffbffce2a2c4>] __sta_info_flush+0xec/0x130 [mac80211]
[<ffffffbffce3dc48>] ieee80211_nan_func_match+0x1a34/0x23e4 [mac80211]
[<ffffffbffcde03e0>] __cfg80211_stop_ap+0x60/0xf0 [cfg80211]
[<ffffffbffcdb6d08>] __cfg80211_leave+0x110/0x150 [cfg80211]
[<ffffffbffcdb6d78>] cfg80211_leave+0x30/0x48 [cfg80211]
[<ffffffbffcdb6fbc>] cfg80211_init_wdev+0x22c/0x808 [cfg80211]
[<ffffffc0000afe28>] notifier_call_chain+0x50/0x84
[<ffffffc0000afefc>] raw_notifier_call_chain+0x14/0x1c
[<ffffffc0004ae94c>] call_netdevice_notifiers_info+0x5c/0x6c
[<ffffffc0004ae96c>] call_netdevice_notifiers+0x10/0x18
[<ffffffc0004aea80>] __dev_close_many+0x54/0xc0
[<ffffffc0004aeb50>] dev_close_many+0x64/0xdc
[<ffffffc0004b0b70>] rollback_registered_many+0x138/0x2f4
[<ffffffc0004b0d4c>] rollback_registered+0x20/0x34
[<ffffffc0004b34b4>] unregister_netdevice_queue+0x68/0xa8
[<ffffffbffce3870c>] ieee80211_if_remove+0x84/0xc0 [mac80211]
[<ffffffbffce3e588>] ieee80211_nan_func_match+0x2374/0x23e4 [mac80211]
[<ffffffbffcdc29e8>] cfg80211_wext_giwscan+0x1000/0x1140 [cfg80211]
[<ffffffbffcb2a87c>] backport_genlmsg_multicast_allns+0x158/0x1b4 [compat]
[<ffffffc0004e0944>] genl_family_rcv_msg+0x258/0x2c0
[<ffffffc0004e09f4>] genl_rcv_msg+0x48/0x6c
[<ffffffc0004dfb50>] netlink_rcv_skb+0x5c/0xc4
[<ffffffc0004e06d8>] genl_rcv+0x34/0x48
[<ffffffc0004df570>] netlink_unicast+0x12c/0x1e0
[<ffffffc0004df9a4>] netlink_sendmsg+0x2bc/0x2dc
[<ffffffc00049a540>] sock_sendmsg+0x18/0x2c
[<ffffffc00049ab94>] ___sys_sendmsg+0x1bc/0x248
[<ffffffc00049ba24>] __sys_sendmsg+0x40/0x68
[<ffffffc00049ba5c>] SyS_sendmsg+0x10/0x20
[<ffffffc000085db0>] el0_svc_naked+0x24/0x28

Signed-off-by: Karthikeyan Periyasamy <periyasa@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/ath11k/core.c | 1 +
drivers/net/wireless/ath/ath11k/core.h | 1 +
drivers/net/wireless/ath/ath11k/mac.c | 18 +++++++++++-------
3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index 9e823056e6735..6a30601a12e8c 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -607,6 +607,7 @@ void ath11k_core_halt(struct ath11k *ar)
lockdep_assert_held(&ar->conf_mutex);

ar->num_created_vdevs = 0;
+ ar->allocated_vdev_map = 0;

ath11k_mac_scan_finish(ar);
ath11k_mac_peer_cleanup_all(ar);
diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 25cdcf71d0c48..987f62bdb9ca3 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -486,6 +486,7 @@ struct ath11k {
int max_num_peers;
u32 num_started_vdevs;
u32 num_created_vdevs;
+ unsigned long long allocated_vdev_map;

struct idr txmgmt_idr;
/* protects txmgmt_idr data */
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 6640662f5ede0..78f20ba47b37e 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -369,8 +369,10 @@ struct ath11k_vif *ath11k_mac_get_arvif(struct ath11k *ar, u32 vdev_id)
flags,
ath11k_get_arvif_iter,
&arvif_iter);
- if (!arvif_iter.arvif)
+ if (!arvif_iter.arvif) {
+ ath11k_warn(ar->ab, "No VIF found for vdev %d\n", vdev_id);
return NULL;
+ }

return arvif_iter.arvif;
}
@@ -398,14 +400,12 @@ struct ath11k *ath11k_mac_get_ar_by_vdev_id(struct ath11k_base *ab, u32 vdev_id)
{
int i;
struct ath11k_pdev *pdev;
- struct ath11k_vif *arvif;

for (i = 0; i < ab->num_radios; i++) {
pdev = rcu_dereference(ab->pdevs_active[i]);
if (pdev && pdev->ar) {
- arvif = ath11k_mac_get_arvif(pdev->ar, vdev_id);
- if (arvif)
- return arvif->ar;
+ if (pdev->ar->allocated_vdev_map & (1LL << vdev_id))
+ return pdev->ar;
}
}

@@ -3874,6 +3874,7 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
ar->num_started_vdevs = 0;
ar->num_created_vdevs = 0;
ar->num_peers = 0;
+ ar->allocated_vdev_map = 0;

/* Configure monitor status ring with default rx_filter to get rx status
* such as rssi, rx_duration.
@@ -4112,8 +4113,9 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
}

ar->num_created_vdevs++;
-
+ ar->allocated_vdev_map |= 1LL << arvif->vdev_id;
ab->free_vdev_map &= ~(1LL << arvif->vdev_id);
+
spin_lock_bh(&ar->data_lock);
list_add(&arvif->list, &ar->arvifs);
spin_unlock_bh(&ar->data_lock);
@@ -4227,6 +4229,7 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
err_vdev_del:
ath11k_wmi_vdev_delete(ar, arvif->vdev_id);
ar->num_created_vdevs--;
+ ar->allocated_vdev_map &= ~(1LL << arvif->vdev_id);
ab->free_vdev_map |= 1LL << arvif->vdev_id;
spin_lock_bh(&ar->data_lock);
list_del(&arvif->list);
@@ -4263,7 +4266,6 @@ static void ath11k_mac_op_remove_interface(struct ieee80211_hw *hw,
ath11k_dbg(ab, ATH11K_DBG_MAC, "mac remove interface (vdev %d)\n",
arvif->vdev_id);

- ab->free_vdev_map |= 1LL << (arvif->vdev_id);
spin_lock_bh(&ar->data_lock);
list_del(&arvif->list);
spin_unlock_bh(&ar->data_lock);
@@ -4281,6 +4283,8 @@ static void ath11k_mac_op_remove_interface(struct ieee80211_hw *hw,
arvif->vdev_id, ret);

ar->num_created_vdevs--;
+ ar->allocated_vdev_map &= ~(1LL << arvif->vdev_id);
+ ab->free_vdev_map |= 1LL << (arvif->vdev_id);

ath11k_peer_cleanup(ar, arvif->vdev_id);

--
2.20.1