netdev - [PATCH net-next 04/12] net: mvpp2: do not update the queue mode while probing

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Date:   Wed, 19 Sep 2018 11:27:03 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     davem@...emloft.net
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, stefanc@...vell.com, ymarkman@...vell.com,
        mw@...ihalf.com
Subject: [PATCH net-next 04/12] net: mvpp2: do not update the queue mode while probing

This patch updates the probing function so that the queue mode isn't
updated while probing, as the driver would silently end up using a
configuration not wanted by the user. The patch adds an extra check to
validate the chosen queue mode instead, and the driver will fail to
probe if the configuration is invalid.

Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 69ab80911756..546328041898 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -4243,6 +4243,10 @@ static bool mvpp2_port_has_irqs(struct mvpp2 *priv,
 	char name[5];
 	int i;
 
+	/* ACPI */
+	if (!port_node)
+		return true;
+
 	if (priv->hw_version == MVPP21)
 		return false;
 
@@ -4637,16 +4641,13 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 	int phy_mode;
 	int err, i, cpu;
 
-	if (port_node) {
-		has_tx_irqs = mvpp2_port_has_irqs(priv, port_node, &flags);
-	} else {
-		has_tx_irqs = true;
-		queue_mode = MVPP2_QDIST_MULTI_MODE;
+	has_tx_irqs = mvpp2_port_has_irqs(priv, port_node, &flags);
+	if (!has_tx_irqs && queue_mode == MVPP2_QDIST_MULTI_MODE) {
+		dev_err(&pdev->dev,
+			"not enough IRQs to support multi queue mode\n");
+		return -EINVAL;
 	}
 
-	if (!has_tx_irqs)
-		queue_mode = MVPP2_QDIST_SINGLE_MODE;
-
 	ntxqs = MVPP2_MAX_TXQ;
 	if (priv->hw_version == MVPP22 && queue_mode == MVPP2_QDIST_MULTI_MODE)
 		nrxqs = MVPP2_DEFAULT_RXQ * num_possible_cpus();
-- 
2.17.1