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