linux-kernel - [PATCH 3.12 223/235] bna: Add synchronization for tx ring.

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Date:   Fri, 27 Jan 2017 11:55:56 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Benjamin Poirier <bpoirier@...e.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 223/235] bna: Add synchronization for tx ring.

From: Benjamin Poirier <bpoirier@...e.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit d667f78514c656a6a8bf0b3d6134a7fe5cd4d317 upstream.

We received two reports of BUG_ON in bnad_txcmpl_process() where
hw_consumer_index appeared to be ahead of producer_index. Out of order
write/read of these variables could explain these reports.

bnad_start_xmit(), as a producer of tx descriptors, has a few memory
barriers sprinkled around writes to producer_index and the device's
doorbell but they're not paired with anything in bnad_txcmpl_process(), a
consumer.

Since we are synchronizing with a device, we must use mandatory barriers,
not smp_*. Also, I didn't see the purpose of the last smp_mb() in
bnad_start_xmit().

Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/brocade/bna/bnad.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index 45ce6e2214b3..2deabae1d66e 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -193,6 +193,7 @@ bnad_txcmpl_process(struct bnad *bnad, struct bna_tcb *tcb)
 		return 0;

 	hw_cons = *(tcb->hw_consumer_index);
+	rmb();
 	cons = tcb->consumer_index;
 	q_depth = tcb->q_depth;

@@ -2906,13 +2907,12 @@ bnad_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 	BNA_QE_INDX_INC(prod, q_depth);
 	tcb->producer_index = prod;

-	smp_mb();
+	wmb();

 	if (unlikely(!test_bit(BNAD_TXQ_TX_STARTED, &tcb->flags)))
 		return NETDEV_TX_OK;

 	bna_txq_prod_indx_doorbell(tcb);
-	smp_mb();

 	return NETDEV_TX_OK;
 }
-- 
2.11.0