net: dsa: b53: Do not fail when IRQ are not initialized

ffainelli · davem330 · commit b2ddc48a81b5 · 2018-09-13T10:19:14.000-07:00
When the Device Tree is not providing the per-port interrupts, do not fail during b53_srab_irq_enable() but instead bail out gracefully. The SRAB driver is used on the BCM5301X (Northstar) platforms which do not yet have the SRAB interrupts wired up. Fixes: 1699437 ("net: dsa: b53: Make SRAB driver manage port interrupts") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
@@ -415,7 +415,13 @@ static int b53_srab_irq_enable(struct b53_device *dev, int port)
 {
 	struct b53_srab_priv *priv = dev->priv;
 	struct b53_srab_port_priv *p = &priv->port_intrs[port];
-	int ret;
+	int ret = 0;
+
+	/* Interrupt is optional and was not specified, do not make
+	 * this fatal
+	 */
+	if (p->irq == -ENXIO)
+		return ret;
 
 	ret = request_threaded_irq(p->irq, b53_srab_port_isr,
 				   b53_srab_port_thread, 0,
