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realtek: ignore disabled switch ports

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When marking a switch port as disabled in the device tree, by using
'status = "disabled";', the switch driver fails on boot, causing a
restart:

    CPU 0 Unable to handle kernel paging request at virtual address
    00000000, epc == 802c3064, ra == 8022b4b4
        [ ... ]
    Call Trace:
    [<802c3064>] strlen+0x0/0x2c
    [<8022b4b4>] start_creating.part.0+0x78/0x194
    [<8022bd3c>] debugfs_create_dir+0x44/0x1c0
    [<80396dfc>] rtl838x_dbgfs_port_init+0x54/0x258
    [<80397508>] rtl838x_dbgfs_init+0xe0/0x56c

This is caused by the DSA subsystem (mostly) ignoring the port, while
rtl83xx_mdio_probe() still extracts some details on this disabled port
from the device tree, resulting in the usage of a NULL pointer where a
port name is expected.

By not probing ignoring disabled ports, no attempt is made to create a
debugfs directory later. The device then boots as expected without the
disabled port.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
This commit is contained in:
Sander Vanheule 2022-08-29 08:23:49 +02:00
parent f8c87aa2d2
commit 9a7f17e11f
1 changed files with 3 additions and 0 deletions
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3
target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/common.c
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@ -317,6 +317,9 @@ static int __init rtl83xx_mdio_probe(struct rtl838x_switch_priv *priv)
phy_interface_t interface;
u32 led_set;
if (!of_device_is_available(dn))
continue;
if (of_property_read_u32(dn, "reg", &pn))
continue;