[PATCH ath-current v3] wifi: ath11k: reset ar->num_stations on hardware start

[PATCH ath-current v3] wifi: ath11k: reset ar->num_stations on hardware start

[Nicolas Escande]

When (multiple) hw restart occurs, we end up in a situation where we
cannot accept new stations / mesh peers. This seems to be the
'num_stations' in 'struct ath11k' that did not get reset properly in
this case. In ath11k_mac_op_start(), it was indeed the only accounting var
that did not get reset so let's clear it too.

This avoids problems like those:

	[1248828.088023] WARNING: CPU: 0 PID: 12281 at net/mac80211/util.c:1682 ieee80211_reconfig_stations+0x98/0xc0
	[1248828.088115] Call trace:
	[1248828.088116]  ieee80211_reconfig_stations+0x98/0xc0 (P)
	[1248828.088119]  ieee80211_reconfig+0x774/0x1438
	[1248828.088123]  ieee80211_restart_work+0x10c/0x178
	[1248828.088127]  process_one_work+0x178/0x3c0
	[1248828.088130]  worker_thread+0x280/0x440
	[1248828.088133]  kthread+0xe0/0xf8
	[1248828.088137]  ret_from_fork+0x10/0x20
	[1248828.088141] ---[ end trace 0000000000000000 ]---
	[1248836.686604] ath11k_pci 0000:04:00.0: refusing to associate station: too many connected already (128)
	[1248836.686609] ath11k_pci 0000:04:00.0: Failed to add station: xx:xx:xx:xx:xx:xx for VDEV: 1

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.9.0.1-01977-QCAHKSWPL_SILICONZ-1

Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Nicolas Escande <nico.escande@gmail.com>
---
Changes in v3:
- Fixed message typos
- Trimmed stacktrace
- Added hardware revision to Tested-on
- Link to v2: https://patch.msgid.link/20260730140306.133718-1-nico.escande@gmail.com

Changes in v2
- rebased on ath/master
- no code change
- Link to v1: https://patch.msgid.link/20260729080932.3462066-1-nico.escande@gmail.com
---
 drivers/net/wireless/ath/ath11k/mac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 2d55cdc4d165..0baa46df1fb9 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -6699,6 +6699,7 @@ 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->num_stations = 0;
 	ar->allocated_vdev_map = 0;
 
 	/* Configure monitor status ring with default rx_filter to get rx status

---
base-commit: e07447e654476262558bee570f4cf456e2b32565
change-id: 20260812-num-station-d33483331299

Best regards,
--  
Nicolas Escande <nico.escande@gmail.com>