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

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Date:   Mon,  9 Jan 2023 16:33:39 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "David S. Miller" <davem@...emloft.net>,
        gregkh@...uxfoundation.org, Jakub Kicinski <kuba@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Sasha Levin <sashal@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        stable@...r.kernel.org,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH] ravb: Fix "failed to switch device to config mode" message during unbind

commit c72a7e42592b2e18d862cf120876070947000d7a upstream.

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: c156633f1353 ("Renesas Ethernet AVB driver proper")
Cc: stable@...r.kernel.org # 4.14.y
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Link: https://lore.kernel.org/r/20221214105118.2495313-1-biju.das.jz@bp.renesas.com
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
[biju: cherry-picked from 6.0 stable]
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
Resending to 4.14 with confilcts[1] fixed
[1] https://lore.kernel.org/stable/16728418126244@kroah.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 5513475e2a82..4c8a4e6efb9f 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2195,11 +2195,11 @@ 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);
 	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);
 	free_netdev(ndev);
 	platform_set_drvdata(pdev, NULL);
-- 
2.25.1