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Mike Leach e4b7d7297d coresight: cti: Fix null pointer error on CTI init before ETM [ Upstream commit `3dc228b353` ] When CTI is discovered first then the function coresight_set_assoc_ectdev_mutex() is called to set the association between CTI and ETM device. Recent lockdep fix passes a null pointer. This patch passes the correct pointer. Before patch: log of boot oops sequence with CTI discovered first: [ 12.424091] cs_system_cfg: CoreSight Configuration manager initialised [ 12.483474] coresight cti_sys0: CTI initialized [ 12.488109] coresight cti_sys1: CTI initialized [ 12.503594] coresight cti_cpu0: CTI initialized [ 12.517877] coresight-cpu-debug 850000.debug: Coresight debug-CPU0 initialized [ 12.523479] coresight-cpu-debug 852000.debug: Coresight debug-CPU1 initialized [ 12.529926] coresight-cpu-debug 854000.debug: Coresight debug-CPU2 initialized [ 12.541808] coresight stm0: STM32 initialized [ 12.544421] coresight-cpu-debug 856000.debug: Coresight debug-CPU3 initialized [ 12.585639] coresight cti_cpu1: CTI initialized [ 12.614028] coresight cti_cpu2: CTI initialized [ 12.631679] CSCFG registered etm0 [ 12.633920] coresight etm0: CPU0: etm v4.0 initialized [ 12.656392] coresight cti_cpu3: CTI initialized ... [ 12.708383] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000348 ... [ 12.755094] Internal error: Oops: 0000000096000044 [#1] SMP [ 12.761817] Modules linked in: coresight_etm4x(+) coresight_tmc coresight_cpu_debug coresight_replicator coresight_funnel coresight_cti coresight_tpiu coresight_stm coresight [ 12.767210] CPU: 3 PID: 1346 Comm: systemd-udevd Not tainted 6.1.0-rc3tid-v6tid-v6-235166-gf7f7d7a2204a-dirty #498 [ 12.782827] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) [ 12.793154] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 12.800010] pc : coresight_set_assoc_ectdev_mutex+0x30/0x50 [coresight] [ 12.806694] lr : coresight_set_assoc_ectdev_mutex+0x30/0x50 [coresight] ... [ 12.885064] Call trace: [ 12.892352] coresight_set_assoc_ectdev_mutex+0x30/0x50 [coresight] [ 12.894693] cti_add_assoc_to_csdev+0x144/0x1b0 [coresight_cti] [ 12.900943] coresight_register+0x2c8/0x320 [coresight] [ 12.906844] etm4_add_coresight_dev.isra.27+0x148/0x280 [coresight_etm4x] [ 12.912056] etm4_probe+0x144/0x1c0 [coresight_etm4x] [ 12.918998] etm4_probe_amba+0x40/0x78 [coresight_etm4x] [ 12.924032] amba_probe+0x11c/0x1f0 After patch: similar log [ 12.444467] cs_system_cfg: CoreSight Configuration manager initialised [ 12.456329] coresight-cpu-debug 850000.debug: Coresight debug-CPU0 initialized [ 12.456754] coresight-cpu-debug 852000.debug: Coresight debug-CPU1 initialized [ 12.469672] coresight-cpu-debug 854000.debug: Coresight debug-CPU2 initialized [ 12.476098] coresight-cpu-debug 856000.debug: Coresight debug-CPU3 initialized [ 12.532409] coresight stm0: STM32 initialized [ 12.533708] coresight cti_sys0: CTI initialized [ 12.539478] coresight cti_sys1: CTI initialized [ 12.550106] coresight cti_cpu0: CTI initialized [ 12.633931] coresight cti_cpu1: CTI initialized [ 12.634664] coresight cti_cpu2: CTI initialized [ 12.638090] coresight cti_cpu3: CTI initialized [ 12.721136] CSCFG registered etm0 ... [ 12.762643] CSCFG registered etm1 [ 12.762666] coresight etm1: CPU1: etm v4.0 initialized [ 12.776258] CSCFG registered etm2 [ 12.776282] coresight etm2: CPU2: etm v4.0 initialized [ 12.784357] CSCFG registered etm3 [ 12.785455] coresight etm3: CPU3: etm v4.0 initialized Error can also be triggered by manually starting the modules using modprobe in the following order: root@linaro-developer:/home/linaro/cs-mods# modprobe coresight root@linaro-developer:/home/linaro/cs-mods# modprobe coresight-cti root@linaro-developer:/home/linaro/cs-mods# modprobe coresight-etm4x Tested on Dragonboard DB410c Applies to coresight/next Fixes: `23722fb467` ("coresight: Fix possible deadlock with lock dependency") Signed-off-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20221123193818.6253-1-mike.leach@linaro.org Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2022-12-31 13:32:41 +01:00
arch	riscv: Fix P4D_SHIFT definition for 3-level page table mode	2022-12-31 13:32:38 +01:00
block	block: clear ->slave_dir when dropping the main slave_dir reference	2022-12-31 13:32:12 +01:00
certs	certs: make system keyring depend on built-in x509 parser	2022-09-24 04:31:18 +09:00
crypto	crypto: tcrypt - Fix multibuffer skcipher speed test mem leak	2022-12-31 13:32:34 +01:00
Documentation	dt-bindings: visconti-pcie: Fix interrupts array max constraints	2022-12-31 13:32:33 +01:00
drivers	coresight: cti: Fix null pointer error on CTI init before ETM	2022-12-31 13:32:41 +01:00
fs	f2fs: fix iostat parameter for discard	2022-12-31 13:32:38 +01:00
include	iio: adis: add '__adis_enable_irq()' implementation	2022-12-31 13:32:41 +01:00
init	init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash	2022-11-22 22:42:38 +09:00
io_uring	io_uring: Fix a null-ptr-deref in io_tctx_exit_cb()	2022-12-07 06:45:20 -07:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	padata: Fix list iterator in padata_do_serial()	2022-12-31 13:32:34 +01:00
lib	test_firmware: fix memory leak in test_firmware_init()	2022-12-31 13:32:40 +01:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
net	net: dsa: tag_8021q: avoid leaking ctx on dsa_tag_8021q_register() error path	2022-12-31 13:32:29 +01:00
rust	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
samples	samples/bpf: Fix MAC address swapping in xdp2_kern	2022-12-31 13:32:03 +01:00
scripts	- Handle different output of readelf on different distros running	2022-11-27 12:08:17 -08:00
security	apparmor: Fix memleak in alloc_ns()	2022-12-31 13:32:31 +01:00
sound	ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt	2022-12-31 13:32:22 +01:00
tools	bpftool: Fix memory leak in do_build_table_cb	2022-12-31 13:32:23 +01:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	Merge branch 'kvm-dwmw2-fixes' into HEAD	2022-11-23 18:59:45 -05:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
Makefile	Linux 6.1.1	2022-12-21 17:48:12 +01:00
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.