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Maíra Canal f483eda89a drm/vc4: drop all currently held locks if deadlock happens [ Upstream commit `479d4f0be4` ] If vc4_hdmi_reset_link() returns -EDEADLK, it means that a deadlock happened in the locking context. This situation should be addressed by dropping all currently held locks and block until the contended lock becomes available. Currently, vc4 is not dealing with the deadlock properly, producing the following output when PROVE_LOCKING is enabled: [ 825.612809] ------------[ cut here ]------------ [ 825.612852] WARNING: CPU: 1 PID: 116 at drivers/gpu/drm/drm_modeset_lock.c:276 drm_modeset_drop_locks+0x60/0x68 [drm] [ 825.613458] Modules linked in: 8021q mrp garp stp llc raspberrypi_cpufreq brcmfmac brcmutil crct10dif_ce hci_uart cfg80211 btqca btbcm bluetooth vc4 raspberrypi_hwmon snd_soc_hdmi_codec cec clk_raspberrypi ecdh_generic drm_display_helper ecc rfkill drm_dma_helper drm_kms_helper pwm_bcm2835 bcm2835_thermal bcm2835_rng rng_core i2c_bcm2835 drm fuse ip_tables x_tables ipv6 [ 825.613735] CPU: 1 PID: 116 Comm: kworker/1:2 Tainted: G W 6.1.0-rc6-01399-g941aae326315 #3 [ 825.613759] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) [ 825.613777] Workqueue: events output_poll_execute [drm_kms_helper] [ 825.614038] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 825.614063] pc : drm_modeset_drop_locks+0x60/0x68 [drm] [ 825.614603] lr : drm_helper_probe_detect+0x120/0x1b4 [drm_kms_helper] [ 825.614829] sp : ffff800008313bf0 [ 825.614844] x29: ffff800008313bf0 x28: ffffcd7778b8b000 x27: 0000000000000000 [ 825.614883] x26: 0000000000000001 x25: 0000000000000001 x24: ffff677cc35c2758 [ 825.614920] x23: ffffcd7707d01430 x22: ffffcd7707c3edc7 x21: 0000000000000001 [ 825.614958] x20: 0000000000000000 x19: ffff800008313c10 x18: 000000000000b6d3 [ 825.614995] x17: ffffcd777835e214 x16: ffffcd7777cef870 x15: fffff81000000000 [ 825.615033] x14: 0000000000000000 x13: 0000000000000099 x12: 0000000000000002 [ 825.615070] x11: 72917988020af800 x10: 72917988020af800 x9 : 72917988020af800 [ 825.615108] x8 : ffff677cc665e0a8 x7 : d00a8c180000110c x6 : ffffcd77774c0054 [ 825.615145] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 [ 825.615181] x2 : ffff677cc55e1880 x1 : ffffcd7777cef8ec x0 : ffff800008313c10 [ 825.615219] Call trace: [ 825.615232] drm_modeset_drop_locks+0x60/0x68 [drm] [ 825.615773] drm_helper_probe_detect+0x120/0x1b4 [drm_kms_helper] [ 825.616003] output_poll_execute+0xe4/0x224 [drm_kms_helper] [ 825.616233] process_one_work+0x2b4/0x618 [ 825.616264] worker_thread+0x24c/0x464 [ 825.616288] kthread+0xec/0x110 [ 825.616310] ret_from_fork+0x10/0x20 [ 825.616335] irq event stamp: 7634 [ 825.616349] hardirqs last enabled at (7633): [<ffffcd777831ee90>] _raw_spin_unlock_irq+0x3c/0x78 [ 825.616384] hardirqs last disabled at (7634): [<ffffcd7778315a78>] __schedule+0x134/0x9f0 [ 825.616411] softirqs last enabled at (7630): [<ffffcd7707aacea0>] local_bh_enable+0x4/0x30 [ipv6] [ 825.617019] softirqs last disabled at (7618): [<ffffcd7707aace70>] local_bh_disable+0x4/0x30 [ipv6] [ 825.617586] ---[ end trace 0000000000000000 ]--- Therefore, deal with the deadlock as suggested by [1], using the function drm_modeset_backoff(). [1] https://docs.kernel.org/gpu/drm-kms.html?highlight=kms#kms-locking Fixes: `6bed2ea3cb` ("drm/vc4: hdmi: Reset link on hotplug") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Maíra Canal <mcanal@igalia.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20221229194638.178712-1-mcanal@igalia.com Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2023-03-10 09:28:27 +01:00
arch	LoongArch, bpf: Use 4 instructions for function address in JIT	2023-03-10 09:28:23 +01:00
block	block: use proper return value from bio_failfast()	2023-03-10 09:27:58 +01:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-01-31 17:53:01 +09:00
crypto	crypto: rsa-pkcs1pad - Use akcipher_request_complete	2023-03-10 09:28:18 +01:00
Documentation	x86:	2023-02-18 11:07:32 -08:00
drivers	drm/vc4: drop all currently held locks if deadlock happens	2023-03-10 09:28:27 +01:00
fs	erofs: relinquish volume with mutex held	2023-03-10 09:27:57 +01:00
include	net/mlx4_en: Introduce flexible array to silence overflow warning	2023-03-10 09:28:24 +01:00
init	Kbuild fixes for v6.2 (3rd)	2023-01-21 10:56:37 -08:00
io_uring	io_uring,audit: don't log IORING_OP_MADVISE	2023-03-10 09:27:56 +01:00
ipc	Non-MM patches for 6.2-rc1.	2022-12-12 17:28:58 -08:00
kernel	bpf: Fix global subprog context argument resolution logic	2023-03-10 09:28:23 +01:00
lib	lib/mpi: Fix buffer overrun when SG is too long	2023-03-10 09:28:05 +01:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	Six hotfixes. Five are cc:stable: four for MM, one for nilfs2. Also a	2023-02-17 17:51:40 -08:00
net	l2tp: Avoid possible recursive deadlock in l2tp_tunnel_register()	2023-03-10 09:28:24 +01:00
rust	rust: print: avoid evaluating arguments in `pr_*` macros in `unsafe` blocks	2023-01-16 00:54:35 +01:00
samples	ftrace: Export ftrace_free_filter() to modules	2023-01-24 11:20:58 -05:00
scripts	bpf_doc: Fix build error with older python versions	2023-03-10 09:28:05 +01:00
security	randstruct: disable Clang 15 support	2023-02-25 11:13:30 +01:00
sound	ALSA: hda: cs35l41: Correct error condition handling	2023-03-03 11:56:16 +01:00
tools	sefltests: netdevsim: wait for devlink instance after netns removal	2023-03-10 09:28:25 +01:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	VFIO fixes for v6.2-rc6	2023-01-23 11:56:07 -08:00
.clang-format	iommufd for 6.2	2022-12-14 09:15:43 -08:00
.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	.gitignore: ignore *.rpm	2022-12-30 17:22:14 +09:00
.mailmap	12 hotfixes, mostly against mm/. Five of these fixes are cc:stable.	2023-02-13 14:09:20 -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: update SCTP maintainers	2023-02-02 11:35:33 -08:00
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	audit: update the mailing list in MAINTAINERS	2023-02-25 11:13:29 +01:00
Makefile	Linux 6.2.2	2023-03-03 11:56:18 +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.