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authorRussell King <rmk+kernel@armlinux.org.uk>2020-03-31 17:17:36 +0300
committerDavid S. Miller <davem@davemloft.net>2020-03-31 20:09:07 +0300
commit765bda93d043c7c0c15305a916e0fa553fdd9964 (patch)
tree3647c403a61d1c3fc8e48fe03b473381d408019c /net
parent41c55ea6c2a7ca4c663eeec05bdf54f4e2419699 (diff)
downloadlinux-765bda93d043c7c0c15305a916e0fa553fdd9964.tar.xz
net: dsa: fix oops while probing Marvell DSA switches
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@armlinux.org.uk> Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/dsa/slave.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 9692a726f2ed..5390ff541658 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1585,7 +1585,8 @@ void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
{
const struct dsa_port *dp = dsa_to_port(ds, port);
- phylink_mac_change(dp->pl, up);
+ if (dp->pl)
+ phylink_mac_change(dp->pl, up);
}
EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);