This is a note to let you know that I've just added the patch titled
net: phy: micrel: Do not use kszphy_suspend/resume for KSZ8061
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-phy-micrel-do-not-use-kszphy_suspend-resume-for-ksz8061.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e333eed63a091a09bd0db191b7710c594c6e995b Mon Sep 17 00:00:00 2001
From: Fabio Estevam <festevam@xxxxxxx>
Date: Wed, 4 May 2022 11:31:03 -0300
Subject: net: phy: micrel: Do not use kszphy_suspend/resume for KSZ8061
From: Fabio Estevam <festevam@xxxxxxx>
commit e333eed63a091a09bd0db191b7710c594c6e995b upstream.
Since commit f1131b9c23fb ("net: phy: micrel: use
kszphy_suspend()/kszphy_resume for irq aware devices") the following
NULL pointer dereference is observed on a board with KSZ8061:
# udhcpc -i eth0
udhcpc: started, v1.35.0
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008
pgd = f73cef4e
[00000008] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 196 Comm: ifconfig Not tainted 5.15.37-dirty #94
Hardware name: Freescale i.MX6 SoloX (Device Tree)
PC is at kszphy_config_reset+0x10/0x114
LR is at kszphy_resume+0x24/0x64
...
The KSZ8061 phy_driver structure does not have the .probe/..driver_data
fields, which means that priv is not allocated.
This causes the NULL pointer dereference inside kszphy_config_reset().
Fix the problem by using the generic suspend/resume functions as before.
Another alternative would be to provide the .probe and .driver_data
information into the structure, but to be on the safe side, let's
just restore Ethernet functionality by using the generic suspend/resume.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: f1131b9c23fb ("net: phy: micrel: use kszphy_suspend()/kszphy_resume for irq aware devices")
Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Link: https://lore.kernel.org/r/20220504143104.1286960-1-festevam@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/phy/micrel.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1669,8 +1669,8 @@ static struct phy_driver ksphy_driver[]
.config_init = ksz8061_config_init,
.config_intr = kszphy_config_intr,
.handle_interrupt = kszphy_handle_interrupt,
- .suspend = kszphy_suspend,
- .resume = kszphy_resume,
+ .suspend = genphy_suspend,
+ .resume = genphy_resume,
}, {
.phy_id = PHY_ID_KSZ9021,
.phy_id_mask = 0x000ffffe,
Patches currently in stable-queue which might be from festevam@xxxxxxx are
queue-5.15/net-phy-micrel-pass-.probe-for-ks8737.patch
queue-5.15/net-phy-micrel-do-not-use-kszphy_suspend-resume-for-ksz8061.patch
