[PATCH 1/2] wifi: ath11k: use RCU when accessing struct inet6_dev::ac_list

[Kalle Valo]

From: Kalle Valo <quic_kvalo at quicinc.com>

Commit c3718936ec47 ("ipv6: anycast: complete RCU handling of struct
ifacaddr6") converted struct inet6_dev::ac_list to use RCU but missed that
ath11k also accesses this list. Now sparse warns:

drivers/net/wireless/ath/ath11k/mac.c:9145:21: warning: incorrect type in assignment (different address spaces)
drivers/net/wireless/ath/ath11k/mac.c:9145:21:    expected struct ifacaddr6 *ifaca6
drivers/net/wireless/ath/ath11k/mac.c:9145:21:    got struct ifacaddr6 [noderef] __rcu *ac_list
drivers/net/wireless/ath/ath11k/mac.c:9145:53: warning: incorrect type in assignment (different address spaces)
drivers/net/wireless/ath/ath11k/mac.c:9145:53:    expected struct ifacaddr6 *ifaca6
drivers/net/wireless/ath/ath11k/mac.c:9145:53:    got struct ifacaddr6 [noderef] __rcu *aca_next

Fix it by using rtnl_dereference(). Also add a note that read_lock_bh() calls
rcu_read_lock() which I was not aware of.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37

Fixes: c3718936ec47 ("ipv6: anycast: complete RCU handling of struct ifacaddr6")
Signed-off-by: Kalle Valo <quic_kvalo at quicinc.com>
---
 drivers/net/wireless/ath/ath11k/mac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index c32be587000d..4fdd56cd30a1 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -9112,6 +9112,7 @@ static void ath11k_mac_op_ipv6_changed(struct ieee80211_hw *hw,
 	offload = &arvif->arp_ns_offload;
 	count = 0;
 
+	/* Note: read_lock_bh() calls rcu_read_lock() */
 	read_lock_bh(&idev->lock);
 
 	memset(offload->ipv6_addr, 0, sizeof(offload->ipv6_addr));
@@ -9142,7 +9143,8 @@ static void ath11k_mac_op_ipv6_changed(struct ieee80211_hw *hw,
 	}
 
 	/* get anycast address */
-	for (ifaca6 = idev->ac_list; ifaca6; ifaca6 = ifaca6->aca_next) {
+	for (ifaca6 = rcu_dereference(idev->ac_list); ifaca6;
+	     ifaca6 = rcu_dereference(ifaca6->aca_next)) {
 		if (count >= ATH11K_IPV6_MAX_COUNT)
 			goto generate;
 
-- 
2.39.2