linux-kernel - [PATCH net] net: macb: ensure interface is not suspended on at91rm9200

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Message-Id: <20200212164538.383741-1-alexandre.belloni@bootlin.com>
Date:   Wed, 12 Feb 2020 17:45:38 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Harini Katakam <harini.katakam@...inx.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH net] net: macb: ensure interface is not suspended on at91rm9200

Because of autosuspend, at91ether_start is called with clocks disabled.
Ensure that pm_runtime doesn't suspend the interface as soon as it is
opened as there is no pm_runtime support is the other relevant parts of the
platform support for at91rm9200.

Fixes: d54f89af6cc4 ("net: macb: Add pm runtime support")
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 4508f0d150da..def94e91883a 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3790,6 +3790,10 @@ static int at91ether_open(struct net_device *dev)
 	u32 ctl;
 	int ret;
 
+	ret = pm_runtime_get_sync(&lp->pdev->dev);
+	if (ret < 0)
+		return ret;
+
 	/* Clear internal statistics */
 	ctl = macb_readl(lp, NCR);
 	macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
@@ -3854,7 +3858,7 @@ static int at91ether_close(struct net_device *dev)
 			  q->rx_buffers, q->rx_buffers_dma);
 	q->rx_buffers = NULL;
 
-	return 0;
+	return pm_runtime_put(&lp->pdev->dev);
 }
 
 /* Transmit packet */
-- 
2.24.1