From: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx>
commit ebaa4b1620bf69f2bc43cb45ea85fbafdaec23c3 upstream.
arvifs list is traversed within data_lock spin_lock in tasklet
context to fill channel information from the corresponding vif.
This means any access to arvifs list for add/del operations
should also be protected with the same spin_lock to avoid the
race. Fix this by performing list add/del on arvfis within the
data_lock. This could fix kernel panic something like the below.
LR is at ath10k_htt_rx_pktlog_completion_handler+0x100/0xb6c [ath10k_core]
PC is at ath10k_htt_rx_pktlog_completion_handler+0x1c0/0xb6c [ath10k_core]
Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[<bf4857f4>] (ath10k_htt_rx_pktlog_completion_handler+0x2f4/0xb6c [ath10k_core])
[<bf487540>] (ath10k_htt_txrx_compl_task+0x8b4/0x1188 [ath10k_core])
[<c00312d4>] (tasklet_action+0x8c/0xec)
[<c00309a8>] (__do_softirq+0xdc/0x208)
[<c0030d6c>] (irq_exit+0x84/0xe0)
[<c005db04>] (__handle_domain_irq+0x80/0xa0)
[<c00085c4>] (gic_handle_irq+0x38/0x5c)
[<c0009640>] (__irq_svc+0x40/0x74)
(gdb) list *(ath10k_htt_rx_pktlog_completion_handler+0x1c0)
0x136c0 is in ath10k_htt_rx_h_channel (drivers/net/wireless/ath/ath10k/htt_rx.c:769)
764 struct cfg80211_chan_def def;
765
766 lockdep_assert_held(&ar->data_lock);
767
768 list_for_each_entry(arvif, &ar->arvifs, list) {
769 if (arvif->vdev_id == vdev_id &&
770 ath10k_mac_vif_chan(arvif->vif, &def) == 0)
771 return def.chan;
772 }
773
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
---
drivers/net/wireless/ath/ath10k/mac.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 4644357d291a..398068ad0b62 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4470,7 +4470,9 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
}
ar->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);
/* It makes no sense to have firmware do keepalives. mac80211 already
* takes care of this with idle connection polling.
@@ -4603,7 +4605,9 @@ err_peer_delete:
err_vdev_delete:
ath10k_wmi_vdev_delete(ar, arvif->vdev_id);
ar->free_vdev_map |= 1LL << arvif->vdev_id;
+ spin_lock_bh(&ar->data_lock);
list_del(&arvif->list);
+ spin_unlock_bh(&ar->data_lock);
err:
if (arvif->beacon_buf) {
@@ -4647,7 +4651,9 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw,
arvif->vdev_id, ret);
ar->free_vdev_map |= 1LL << arvif->vdev_id;
+ spin_lock_bh(&ar->data_lock);
list_del(&arvif->list);
+ spin_unlock_bh(&ar->data_lock);
if (arvif->vdev_type == WMI_VDEV_TYPE_AP ||
arvif->vdev_type == WMI_VDEV_TYPE_IBSS) {
--
2.7.4
