netdev - [PATCH net v2 3/5] net: stmmac: Check if CBS is supported before configuring

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Date:   Wed,  9 Jan 2019 10:05:58 +0100
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     netdev@...r.kernel.org
Cc:     Jose Abreu <jose.abreu@...opsys.com>,
        Joao Pinto <joao.pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: [PATCH net v2 3/5] net: stmmac: Check if CBS is supported before configuring

Check if CBS is currently supported before trying to configure it in HW.

Cc: Joao Pinto <jpinto@...opsys.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
Signed-off-by: Jose Abreu <joabreu@...opsys.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 531294f4978b..58ea18af9813 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -301,6 +301,8 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
 	/* Queue 0 is not AVB capable */
 	if (queue <= 0 || queue >= tx_queues_count)
 		return -EINVAL;
+	if (!priv->dma_cap.av)
+		return -EOPNOTSUPP;
 	if (priv->speed != SPEED_100 && priv->speed != SPEED_1000)
 		return -EOPNOTSUPP;
 
-- 
2.7.4