netdev - [PATCH net-next] ravb: Fix "failed to switch device to config mode" message during unbind

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Date:   Tue, 13 Dec 2022 09:59:38 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Hangbin Liu <liuhangbin@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Masaru Nagai <masaru.nagai.vx@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        stable@...r.kernel.org
Subject: [PATCH net-next] ravb: Fix "failed to switch device to config mode" message during unbind

This patch fixes the error "ravb 11c20000.ethernet eth0: failed to switch
device to config mode" during unbind.

We are doing register access after pm_runtime_put_sync().

We usually do cleanup in reverse order of init. Currently in
remove(), the "pm_runtime_put_sync" is not in reverse order.

Probe
	reset_control_deassert(rstc);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_get_sync(&pdev->dev);

remove
	pm_runtime_put_sync(&pdev->dev);
	unregister_netdev(ndev);
	..
	ravb_mdio_release(priv);
	pm_runtime_disable(&pdev->dev);

Consider the call to unregister_netdev()
unregister_netdev->unregister_netdevice_queue->rollback_registered_many
that calls the below functions which access the registers after
pm_runtime_put_sync()
 1) ravb_get_stats
 2) ravb_close

Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver")
Cc: stable@...r.kernel.org
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 33f723a9f471..b4e0fc7f65bd 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2903,12 +2903,12 @@ static int ravb_remove(struct platform_device *pdev)
 			  priv->desc_bat_dma);
 	/* Set reset mode */
 	ravb_write(ndev, CCC_OPC_RESET, CCC);
-	pm_runtime_put_sync(&pdev->dev);
 	unregister_netdev(ndev);
 	if (info->nc_queues)
 		netif_napi_del(&priv->napi[RAVB_NC]);
 	netif_napi_del(&priv->napi[RAVB_BE]);
 	ravb_mdio_release(priv);
+	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	reset_control_assert(priv->rstc);
 	free_netdev(ndev);
-- 
2.25.1