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Linux mainline fork with MSM8998 patches | https://mainline.space | Currently supported devices: OnePlus 5/5T, Xiaomi Mi 6, F(x)tec Pro¹ (2019 QX1000 model) & Sony Xperia XZ Premium (UNTESTED!)
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Imre Deak e06a46087d drm/i915/dp_mst: Fix mst_mgr lookup during atomic check 
If an MST connector was disabled in the old state during a commit, the
connector's best_encoder will be NULL, so we can't look up mst_mgr via
it. Do the lookup instead via intel_connector->mst_port which always
points to the primary encoder.

This fixes the following:
[   58.922866] BUG: kernel NULL pointer dereference, address: 0000000000000170
[   58.922867] #PF: supervisor read access in kernel mode
[   58.922868] #PF: error_code(0x0000) - not-present page
[   58.922869] PGD 0 P4D 0
[   58.922870] Oops: 0000 [#1] PREEMPT SMP NOPTI
[   58.922872] CPU: 0 PID: 133 Comm: kworker/0:2 Tainted: G     U             6.0.0-rc3-imre+ #560
[   58.922874] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-P DDR5 RVP, BIOS ADLPFWI1.R00.3135.A00.2203251419 03/25/2022
[   58.922874] Workqueue: events output_poll_execute [drm_kms_helper]
[   58.922879] RIP: 0010:intel_dp_mst_atomic_check+0xbb/0x1c0 [i915]
[   58.922955] Code: 5b 7b f6 ff 84 c0 75 41 48 8b 44 24 18 65 48 2b 04 25 28 00 00 00 0f 85 ff 00 00 00 48 8b 45 10 48 8b 93 10 07 00 00 4c 89 e7 <48> 8b b0 70 01 00 00 48 83 c4 20 5b 5d 48 81 c6 f0 0c 00 00 41 5c
[   58.922956] RSP: 0018:ffffc90000633a88 EFLAGS: 00010246
[   58.922957] RAX: 0000000000000000 RBX: ffff888117d19000 RCX: ffff888101893308
[   58.922958] RDX: ffff888122981000 RSI: ffffffff82309ecc RDI: ffff888114da6800
[   58.922959] RBP: ffff8881094bab48 R08: 0000000081917436 R09: 0000000068191743
[   58.922960] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888114da6800
[   58.922960] R13: ffff8881143f8000 R14: 0000000000000000 R15: ffff888119bf2000
[   58.922961] FS:  0000000000000000(0000) GS:ffff888496200000(0000) knlGS:0000000000000000
[   58.922962] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   58.922962] CR2: 0000000000000170 CR3: 0000000005612004 CR4: 0000000000770ef0
[   58.922963] PKRU: 55555554
[   58.922963] Call Trace:
[   58.922964]  <TASK>
[   58.922966]  drm_atomic_helper_check_modeset+0x3f8/0xc70 [drm_kms_helper]
[   58.922972]  intel_atomic_check+0xb1/0x3180 [i915]
[   58.923059]  ? find_held_lock+0x2b/0x80
[   58.923064]  drm_atomic_check_only+0x5d3/0xa60 [drm]
[   58.923082]  drm_atomic_commit+0x56/0xc0 [drm]
[   58.923097]  ? drm_plane_get_damage_clips.cold+0x1c/0x1c [drm]
[   58.923114]  drm_client_modeset_commit_atomic+0x235/0x280 [drm]
[   58.923132]  drm_client_modeset_commit_locked+0x5b/0x190 [drm]
[   58.923148]  drm_client_modeset_commit+0x24/0x50 [drm]
[   58.923164]  drm_fb_helper_set_par+0xae/0xe0 [drm_kms_helper]
[   58.923171]  drm_fb_helper_hotplug_event+0xd5/0xf0 [drm_kms_helper]
[   58.923178]  output_poll_execute+0xac/0x200 [drm_kms_helper]
[   58.923187]  process_one_work+0x268/0x580
[   58.923190]  ? process_one_work+0x580/0x580
[   58.923191]  worker_thread+0x52/0x3b0
[   58.923193]  ? process_one_work+0x580/0x580
[   58.923195]  kthread+0xf0/0x120
[   58.923196]  ? kthread_complete_and_exit+0x20/0x20
[   58.923198]  ret_from_fork+0x1f/0x30
[   58.923202]  </TASK>

Fixes: ffac972193 ("drm/display/dp_mst: Don't open code modeset checks for releasing time slots")
Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220901161933.1004778-1-imre.deak@intel.com
2022-09-02 16:30:57 +03:00
arch - Prepare for and clear .brk early in order to address XenPV guests 2022-07-10 08:43:52 -07:00
block block: remove WARN_ON() from bd_link_disk_holder 2022-06-23 07:48:05 -06:00
certs Certs changes 2022-06-21 12:13:53 -05:00
crypto crypto: s390 - do not depend on CRYPTO_HW for SIMD implementations 2022-07-06 20:04:06 -07:00
Documentation dt-bindings: display: bridge: icn6211: Add support for external REFCLK 2022-08-26 13:54:52 +02:00
drivers drm/i915/dp_mst: Fix mst_mgr lookup during atomic check 2022-09-02 16:30:57 +03:00
fs o_uring-5.19-2022-07-09 2022-07-10 09:14:54 -07:00
include drm/dp: add drm_dp_phy_name() for getting DP PHY name 2022-08-30 11:02:42 +03:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-09 10:11:12 -07:00
ipc These changes update the ipc sysctls so that they are fundamentally 2022-06-03 15:54:57 -07:00
kernel Linux 5.19-rc6 2022-07-13 10:54:56 +10:00
lib ida: don't use BUG_ON() for debugging 2022-07-10 13:55:49 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm Minor things, mainly - mailmap updates, MAINTAINERS updates, etc. 2022-06-26 14:00:55 -07:00
net Networking fixes for 5.19-rc6, including fixes from bpf, netfilter, 2022-07-07 10:08:20 -07:00
samples fprobe, samples: Add module parameter descriptions 2022-06-24 15:23:04 -07:00
scripts kbuild: remove unused cmd_none in scripts/Makefile.modinst 2022-07-10 21:25:15 +09:00
security selinux: free contexts previously transferred in selinux_add_opt() 2022-06-15 21:20:45 -04:00
sound ALSA: cs46xx: Fix missing snd_card_free() call at probe error 2022-07-05 17:24:05 +02:00
tools - Prepare for and clear .brk early in order to address XenPV guests 2022-07-10 08:43:52 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: x86: disable preemption around the call to kvm_arch_vcpu_{un|}blocking 2022-06-09 10:52:20 -04:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap cxl fixes for 5.19-rc6 2022-07-08 12:55:25 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm/exynos: MAINTAINERS: move Joonyoung Shim to credits 2022-07-12 13:52:59 +09:00
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 MAINTAINERS: Add myself as a reviewer for panel-edp.c 2022-08-30 08:45:22 -07:00
Makefile Linux 5.19-rc6 2022-07-10 14:40:51 -07:00
README

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.