[PATCH 6.18 409/752] net: ethernet: xscale: Check for PTP support properly

Sasha Levin
2026-02-28T17:53:50Z

From: Linus Walleij <linusw@kernel.org>

[ Upstream commit 594163ea88a03bdb412063af50fc7177ef3cbeae ]

In ixp4xx_get_ts_info() ixp46x_ptp_find() is called
unconditionally despite this feature only existing on
ixp46x, leading to the following splat from tcpdump:

root@OpenWrt:~# tcpdump -vv -X -i eth0
(...)
Unable to handle kernel NULL pointer dereference at virtual address
00000238 when read
(...)
Call trace:
ptp_clock_index from ixp46x_ptp_find+0x1c/0x38
ixp46x_ptp_find from ixp4xx_get_ts_info+0x4c/0x64
ixp4xx_get_ts_info from __ethtool_get_ts_info+0x90/0x108
__ethtool_get_ts_info from __dev_ethtool+0xa00/0x2648
__dev_ethtool from dev_ethtool+0x160/0x234
dev_ethtool from dev_ioctl+0x2cc/0x460
dev_ioctl from sock_ioctl+0x1ec/0x524
sock_ioctl from sys_ioctl+0x51c/0xa94
sys_ioctl from ret_fast_syscall+0x0/0x44
(...)
Segmentation fault

Check for ixp46x in ixp46x_ptp_find() before trying to set up
PTP to avoid this.

To avoid altering the returned error code from ixp4xx_hwtstamp_set()
which before this patch was -EOPNOTSUPP, we return -EOPNOTSUPP
from ixp4xx_hwtstamp_set() if ixp46x_ptp_find() fails no matter
the error code. The helper function ixp46x_ptp_find() helper
returns -ENODEV.

Fixes: 9055a2f59162 ("ixp4xx_eth: make ptp support a platform driver")
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260219-ixp4xx-fix-ethernet-v3-1-f235ccc3cd46@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/xscale/ixp4xx_eth.c | 5 +----
drivers/net/ethernet/xscale/ptp_ixp46x.c | 3 +++
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
index e1e7f65553e76..b0faa0f1780d0 100644
--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -403,15 +403,12 @@ static int ixp4xx_hwtstamp_set(struct net_device *netdev,
int ret;
int ch;

- if (!cpu_is_ixp46x())
- return -EOPNOTSUPP;
-
if (!netif_running(netdev))
return -EINVAL;

ret = ixp46x_ptp_find(&port->timesync_regs, &port->phc_index);
if (ret)
- return ret;
+ return -EOPNOTSUPP;

ch = PORT2CHANNEL(port);
regs = port->timesync_regs;
diff --git a/drivers/net/ethernet/xscale/ptp_ixp46x.c b/drivers/net/ethernet/xscale/ptp_ixp46x.c
index 94203eb46e6b0..93c64db22a696 100644
--- a/drivers/net/ethernet/xscale/ptp_ixp46x.c
+++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c
@@ -232,6 +232,9 @@ static struct ixp_clock ixp_clock;

int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index)
{
+ if (!cpu_is_ixp46x())
+ return -ENODEV;
+
*regs = ixp_clock.regs;
*phc_index = ptp_clock_index(ixp_clock.ptp_clock);

--
2.51.0