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([82.78.167.125]) by smtp.gmail.com with ESMTPSA id mb22-20020a170906eb1600b009fc0c42098csm4603423ejb.173.2023.11.26.06.10.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Nov 2023 06:10:52 -0800 (PST) From: Claudiu Beznea To: nicolas.ferre@microchip.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk, jgarzik@pobox.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea Subject: [PATCH 2/2] net: macb: Unregister nedev before MDIO bus in remove Date: Sun, 26 Nov 2023 16:10:46 +0200 Message-Id: <20231126141046.3505343-3-claudiu.beznea@tuxon.dev> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> References: <20231126141046.3505343-1-claudiu.beznea@tuxon.dev> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" unregister_netdev() calls the struct net_device_ops::ndo_stop function, which in the case of the macb driver is macb_close(). macb_close() calls, in turn, PHY-specific APIs (e.g., phy_detach()). The call trace is as follows: macb_close() -> phylink_disconnect_phy() -> phy_disconnect() -> phy_detach() phy_detach() will remove associated sysfs files by calling kernfs_remove_by_name_ns(), which will hit "kernfs: cannot remove 'attached_dev', no directory" WARN(), which will throw a stack trace too. To avoid this, call unregiser_netdev() before mdiobus_unregister() and mdiobus_free(). Fixes: 7897b071ac3b ("net: macb: convert to phylink") Signed-off-by: Claudiu Beznea Reviewed-by: Russell King (Oracle) --- drivers/net/ethernet/cadence/macb_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/etherne= t/cadence/macb_main.c index cebae0f418f2..73d041af3de1 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5165,11 +5165,11 @@ static void macb_remove(struct platform_device *pde= v) =20 if (dev) { bp =3D netdev_priv(dev); + unregister_netdev(dev); phy_exit(bp->sgmii_phy); mdiobus_unregister(bp->mii_bus); mdiobus_free(bp->mii_bus); =20 - unregister_netdev(dev); tasklet_kill(&bp->hresp_err_tasklet); pm_runtime_disable(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); --=20 2.39.2