netdev - [PATCH] wifi: ath11k: fix SAC bug on peer addition with sta band migration

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Date:   Thu,  9 Feb 2023 23:26:22 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dan Carpenter <error27@...il.com>
Subject: [PATCH] wifi: ath11k: fix SAC bug on peer addition with sta band migration

Fix sleep in atomic context warning detected by Smatch static checker
analyzer.

Following the locking pattern for peer_rhash_add lock tbl_mtx_lock mutex
always even if sta is not transitioning to another band.
This is peer_add function and a more secure locking should not cause
performance regression.

Fixes: d673cb6fe6c0 ("wifi: ath11k: fix peer addition/deletion error on sta band migration")
Reported-by: Dan Carpenter <error27@...il.com>
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/net/wireless/ath/ath11k/peer.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/peer.c b/drivers/net/wireless/ath/ath11k/peer.c
index 1ae7af02c364..1380811827a8 100644
--- a/drivers/net/wireless/ath/ath11k/peer.c
+++ b/drivers/net/wireless/ath/ath11k/peer.c
@@ -382,22 +382,23 @@ int ath11k_peer_create(struct ath11k *ar, struct ath11k_vif *arvif,
 		return -ENOBUFS;
 	}
 
+	mutex_lock(&ar->ab->tbl_mtx_lock);
 	spin_lock_bh(&ar->ab->base_lock);
 	peer = ath11k_peer_find_by_addr(ar->ab, param->peer_addr);
 	if (peer) {
 		if (peer->vdev_id == param->vdev_id) {
 			spin_unlock_bh(&ar->ab->base_lock);
+			mutex_unlock(&ar->ab->tbl_mtx_lock);
 			return -EINVAL;
 		}
 
 		/* Assume sta is transitioning to another band.
 		 * Remove here the peer from rhash.
 		 */
-		mutex_lock(&ar->ab->tbl_mtx_lock);
 		ath11k_peer_rhash_delete(ar->ab, peer);
-		mutex_unlock(&ar->ab->tbl_mtx_lock);
 	}
 	spin_unlock_bh(&ar->ab->base_lock);
+	mutex_unlock(&ar->ab->tbl_mtx_lock);
 
 	ret = ath11k_wmi_send_peer_create_cmd(ar, param);
 	if (ret) {
-- 
2.38.1