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[v2,4/7] ath10k: protect ar->arvifs linking with data_lock

Message ID 1422621086-28970-5-git-send-email-michal.kazior@tieto.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Michal Kazior Jan. 30, 2015, 12:31 p.m. UTC 
This will make it possible to iterate over
interface list while in an atomic context,
i.e. tasklet.

Caller should still be careful with accessing
arvif structures though.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
---
 drivers/net/wireless/ath/ath10k/mac.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index e099479..ba66a67 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3331,7 +3331,10 @@  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.
@@ -3458,7 +3461,9 @@  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) {
@@ -3493,7 +3498,10 @@  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) {
 		ret = ath10k_peer_delete(arvif->ar, arvif->vdev_id, vif->addr);