wifi: ath6kl: reduce WARN to dev_dbg() in callback

[ Upstream commit 75c4a8154cb6c7239fb55d5550f481f6765fb83c ]

The warn is triggered on a known race condition, documented in the code above
the test, that is correctly handled.  Using WARN() hinders automated testing.
Reducing severity.

Fixes: de2070fc4aa7 ("ath6kl: Fix kernel panic on continuous driver load/unload")
Reported-and-tested-by: syzbot+555908813b2ea35dae9a@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230126182431.867984-1-pchelkin@ispras.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/ath6kl/htc_pipe.c b/drivers/net/wireless/ath/ath6kl/htc_pipe.c
index c688488..9b88d96 100644 (file)
--- a/drivers/net/wireless/ath/ath6kl/htc_pipe.c
+++ b/drivers/net/wireless/ath/ath6kl/htc_pipe.c
@@ -960,8 +960,8 @@ static int ath6kl_htc_pipe_rx_complete(struct ath6kl *ar, struct sk_buff *skb,
         * Thus the possibility of ar->htc_target being NULL
         * via ath6kl_recv_complete -> ath6kl_usb_io_comp_work.
         */
-       if (WARN_ON_ONCE(!target)) {
-               ath6kl_err("Target not yet initialized\n");
+       if (!target) {
+               ath6kl_dbg(ATH6KL_DBG_HTC, "Target not yet initialized\n");
                status = -EINVAL;
                goto free_skb;
        }