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Date:   Tue, 31 Mar 2020 10:09:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rmk+kernel@...linux.org.uk
Cc:     andrew@...n.ch, netdev@...r.kernel.org, f.fainelli@...il.com,
        ioana.ciornei@....com, olteanv@...il.com, vivien.didelot@...il.com,
        kuba@...nel.org
Subject: Re: [PATCH net-next] net: dsa: fix oops while probing Marvell DSA
 switches

From: Russell King <rmk+kernel@...linux.org.uk>
Date: Tue, 31 Mar 2020 15:17:36 +0100

> Fix an oops in dsa_port_phylink_mac_change() caused by a combination
> of a20f997010c4 ("net: dsa: Don't instantiate phylink for CPU/DSA
> ports unless needed") and the net-dsa-improve-serdes-integration
> series of patches 65b7a2c8e369 ("Merge branch
> 'net-dsa-improve-serdes-integration'").
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000124
> pgd = c0004000
> [00000124] *pgd=00000000
> Internal error: Oops: 805 [#1] SMP ARM
> Modules linked in: tag_edsa spi_nor mtd xhci_plat_hcd mv88e6xxx(+) xhci_hcd armada_thermal marvell_cesa dsa_core ehci_orion libdes phy_armada38x_comphy at24 mcp3021 sfp evbug spi_orion sff mdio_i2c
> CPU: 1 PID: 214 Comm: irq/55-mv88e6xx Not tainted 5.6.0+ #470
> Hardware name: Marvell Armada 380/385 (Device Tree)
> PC is at phylink_mac_change+0x10/0x88
> LR is at mv88e6352_serdes_irq_status+0x74/0x94 [mv88e6xxx]
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Applied, thanks.

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