of_get_mac_address returns valid pointer or ERR_PTR since 5.2 via commit
d01f449c008a ("of_net: add NVMEM support to of_get_mac_address") so the
patch fixes following OOPs on nbg6617:
Unable to handle kernel paging request at virtual address ffffffed
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.4.24 #0
PC is at edma_axi_probe+0x444/0x1114
LR is at bus_find_device+0x88/0x9c
Where the PC can be resolved to:
>>> l *edma_axi_probe+0x444
0xc067be5c is in edma_axi_probe (./include/linux/string.h:378).
>>> l *edma_axi_probe+0x43f
0xc067be57 is in edma_axi_probe (drivers/net/ethernet/qualcomm/essedma/edma_axi.c:936)
Which leads to the following code fragment:
935 mac_addr = of_get_mac_address(pnp);
936 if (mac_addr)
937 memcpy(edma_netdev[idx_mac]->dev_addr, mac_addr, ETH_ALEN);
Where using mac_addr=0xffffffed (-ENODEV) as source address in memcpy()
is causing the OOPs.
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
f521ef5ff3