6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Wei Fang <wei.fang@xxxxxxx>
commit 6be063071a457767ee229db13f019c2ec03bfe44 upstream.
Some platforms (such as i.MX25 and i.MX27) do not support PTP, so on
these platforms fec_ptp_init() is not called and the related members
in fep are not initialized. However, fec_ptp_save_state() is called
unconditionally, which causes the kernel to panic. Therefore, add a
condition so that fec_ptp_save_state() is not called if PTP is not
supported.
Fixes: a1477dc87dc4 ("net: fec: Restart PPS after link state change")
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Closes: https://lore.kernel.org/lkml/353e41fe-6bb4-4ee9-9980-2da2a9c1c508@xxxxxxxxxxxx/
Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
Reviewed-by: Csókás, Bence <csokas.bence@xxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20241008061153.1977930-1-wei.fang@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/freescale/fec_main.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1077,7 +1077,8 @@ fec_restart(struct net_device *ndev)
u32 rcntl = OPT_FRAME_SIZE | 0x04;
u32 ecntl = FEC_ECR_ETHEREN;
- fec_ptp_save_state(fep);
+ if (fep->bufdesc_ex)
+ fec_ptp_save_state(fep);
/* Whack a reset. We should wait for this.
* For i.MX6SX SOC, enet use AXI bus, we use disable MAC
@@ -1340,7 +1341,8 @@ fec_stop(struct net_device *ndev)
netdev_err(ndev, "Graceful transmit stop did not complete!\n");
}
- fec_ptp_save_state(fep);
+ if (fep->bufdesc_ex)
+ fec_ptp_save_state(fep);
/* Whack a reset. We should wait for this.
* For i.MX6SX SOC, enet use AXI bus, we use disable MAC
