cxgb4: Properly lock TX queue for the selftest.

[ Upstream commit 9067eccdd7849dd120d5495dbd5a686fa6ed2c1a ]

The selftest for the driver sends a dummy packet and checks if the
packet will be received properly as it should be. The regular TX path
and the selftest can use the same network queue so locking is required
and was missing in the selftest path. This was addressed in the commit
cited below.
Unfortunately locking the TX queue requires BH to be disabled which is
not the case in selftest path which is invoked in process context.
Lockdep should be complaining about this.

Use __netif_tx_lock_bh() for TX queue locking.

Fixes: c650e04898072 ("cxgb4: Fix race between loopback and normal Tx path")
Reported-by: "John B. Wyatt IV" <jwyatt@redhat.com>
Closes: https://lore.kernel.org/all/Zic0ot5aGgR-V4Ks@thinkpad2021/
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240429091147.YWAaal4v@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 98dd78551d89a656544f2d6be753ef0ceb159232..fff1ce835bc0d727521e74de26a2c92152523f90 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -2684,12 +2684,12 @@ int cxgb4_selftest_lb_pkt(struct net_device *netdev)
        lb->loopback = 1;
 
        q = &adap->sge.ethtxq[pi->first_qset];
-       __netif_tx_lock(q->txq, smp_processor_id());
+       __netif_tx_lock_bh(q->txq);
 
        reclaim_completed_tx(adap, &q->q, -1, true);
        credits = txq_avail(&q->q) - ndesc;
        if (unlikely(credits < 0)) {
-               __netif_tx_unlock(q->txq);
+               __netif_tx_unlock_bh(q->txq);
                return -ENOMEM;
        }
 
@@ -2724,7 +2724,7 @@ int cxgb4_selftest_lb_pkt(struct net_device *netdev)
        init_completion(&lb->completion);
        txq_advance(&q->q, ndesc);
        cxgb4_ring_tx_db(adap, &q->q, ndesc);
-       __netif_tx_unlock(q->txq);
+       __netif_tx_unlock_bh(q->txq);
 
        /* wait for the pkt to return */
        ret = wait_for_completion_timeout(&lb->completion, 10 * HZ);