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Thomas Richard (TI) ff02bd303d usb: cdns3: fix role switching during resume [ Upstream commit `87e4b043b9` ] If the role change while we are suspended, the cdns3 driver switches to the new mode during resume. However, switching to host mode in this context causes a NULL pointer dereference. The host role's start() operation registers a xhci-hcd device, but its probe is deferred while we are in the resume path. The host role's resume() operation assumes the xhci-hcd device is already probed, which is not the case, leading to the dereference. Since the start() operation of the new role is already called, the resume operation can be skipped. So skip the resume operation for the new role if a role switch occurs during resume. Once the resume sequence is complete, the xhci-hcd device can be probed in case of host mode. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000208 Mem abort info: ... Data abort info: ... [0000000000000208] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 146 Comm: sh Not tainted 6.19.0-rc7-00013-g6e64f4aabfae-dirty #135 PREEMPT Hardware name: Texas Instruments J7200 EVM (DT) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : usb_hcd_is_primary_hcd+0x0/0x1c lr : cdns_host_resume+0x24/0x5c ... Call trace: usb_hcd_is_primary_hcd+0x0/0x1c (P) cdns_resume+0x6c/0xbc cdns3_controller_resume.isra.0+0xe8/0x17c cdns3_plat_resume+0x18/0x24 platform_pm_resume+0x2c/0x68 dpm_run_callback+0x90/0x248 device_resume+0x100/0x24c dpm_resume+0x190/0x2ec dpm_resume_end+0x18/0x34 suspend_devices_and_enter+0x2b0/0xa44 pm_suspend+0x16c/0x5fc state_store+0x80/0xec kobj_attr_store+0x18/0x2c sysfs_kf_write+0x7c/0x94 kernfs_fop_write_iter+0x130/0x1dc vfs_write+0x240/0x370 ksys_write+0x70/0x108 __arm64_sys_write+0x1c/0x28 invoke_syscall+0x48/0x10c el0_svc_common.constprop.0+0x40/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x34/0x108 el0t_64_sync_handler+0xa0/0xe4 el0t_64_sync+0x198/0x19c Code: 52800003 f9407ca5 d63f00a0 17ffffe4 (f9410401) ---[ end trace 0000000000000000 ]--- Cc: stable <stable@kernel.org> Fixes: `2cf2581cd2` ("usb: cdns3: add power lost support for system resume") Signed-off-by: Thomas Richard (TI) <thomas.richard@bootlin.com> Acked-by: Peter Chen <peter.chen@kernel.org> Link: https://patch.msgid.link/20260130-usb-cdns3-fix-role-switching-during-resume-v1-1-44c456852b52@bootlin.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-04-18 10:33:07 +02:00
arch	ARM: omap2: Fix reference count leaks in omap_control_init()	2026-04-18 10:33:06 +02:00
block	blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs()	2026-03-04 07:19:59 -05:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec	2026-02-06 16:41:53 +01:00
Documentation	PCI: endpoint: Automatically create a function specific attributes group	2026-02-19 16:21:46 +01:00
drivers	usb: cdns3: fix role switching during resume	2026-04-18 10:33:07 +02:00
fs	btrfs: fix incorrect key offset in error message in check_dev_extent_item()	2026-04-18 10:33:06 +02:00
include	ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()	2026-03-04 07:20:36 -05:00
init	init: handle bootloader identifier in kernel parameters	2025-10-19 16:21:45 +02:00
io_uring	io_uring: fix filename leak in __io_openat_prep()	2026-01-19 13:09:54 +01:00
ipc	ipc: fix to protect IPCS lookups using RCU	2025-06-27 11:05:26 +01:00
kernel	bpf: Fix stack-out-of-bounds write in devmap	2026-04-18 10:33:06 +02:00
lib	lib/crypto: aes: Fix missing MMU protection for AES S-box	2026-01-19 13:10:13 +01:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm, page_alloc, thp: prevent reclaim for __GFP_THISNODE THP allocations	2026-03-04 07:20:30 -05:00
net	ip6_tunnel: Fix usage of skb_vlan_inet_prepare()	2026-04-18 10:33:06 +02:00
samples	samples: mei: Fix building on musl libc	2025-08-28 16:24:07 +02:00
scripts	modpost: Amend ppc64 save/restfpr symnames for -Os build	2026-03-04 07:20:06 -05:00
security	apparmor: fix invalid deref of rawdata when export_binary is unset	2026-03-04 07:19:53 -05:00
sound	ALSA: usb-audio: Use inclusive terms	2026-04-18 10:33:06 +02:00
tools	selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs	2026-03-04 07:20:30 -05:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-06-27 11:05:22 +01:00
virt	KVM: Don't clobber irqfd routing type when deassigning irqfd	2026-02-11 13:35:27 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Remove *.orig pattern from .gitignore	2024-10-17 15:11:10 +02:00
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	staging: rtl8712: Remove driver using deprecated API wext	2025-12-07 06:09:36 +09:00
Makefile	Linux 5.15.202	2026-03-04 07:37:37 -05:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.