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Thadeu Lima de Souza Cascardo 94e418935e Revert "media: uvcvideo: Require entities to have a non-zero unique ID" 
commit 8004d635f2 upstream.

This reverts commit 3dd075fe8e.

Tomasz has reported that his device, Generalplus Technology Inc. 808 Camera,
with ID 1b3f:2002, stopped being detected:

$ ls -l /dev/video*
zsh: no matches found: /dev/video*
[    7.230599] usb 3-2: Found multiple Units with ID 5

This particular device is non-compliant, having both the Output Terminal
and Processing Unit with ID 5. uvc_scan_fallback, though, is able to build
a chain. However, when media elements are added and uvc_mc_create_links
call uvc_entity_by_id, it will get the incorrect entity,
media_create_pad_link will WARN, and it will fail to register the entities.

In order to reinstate support for such devices in a timely fashion,
reverting the fix for these warnings is appropriate. A proper fix that
considers the existence of such non-compliant devices will be submitted in
a later development cycle.

Reported-by: Tomasz Sikora <sikora.tomus@gmail.com>
Fixes: 3dd075fe8e ("media: uvcvideo: Require entities to have a non-zero unique ID")
Cc: stable@vger.kernel.org
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250114200045.1401644-1-cascardo@igalia.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-03-13 12:50:28 +01:00
arch mips/math-emu: fix emulation of the prefx instruction 2025-03-13 12:50:28 +01:00
block blk-cgroup: Fix class @block_class's subsystem refcount leakage 2025-03-13 12:50:26 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY 2024-12-14 19:50:44 +01:00
Documentation kconfig: add warn-unknown-symbols sanity check 2025-03-13 12:50:13 +01:00
drivers Revert "media: uvcvideo: Require entities to have a non-zero unique ID" 2025-03-13 12:50:28 +01:00
fs binfmt_flat: Fix integer overflow bug on 32 bit systems 2025-03-13 12:50:24 +01:00
include KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() 2025-03-13 12:50:24 +01:00
init initramfs: avoid filename buffer overrun 2024-12-14 19:50:42 +01:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:06:25 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX 2025-03-13 12:50:17 +01:00
lib lockdep: Fix upper limit for LOCKDEP_*_BITS configs 2025-03-13 12:50:17 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm memblock: drop memblock_free_early_nid() and memblock_free_early() 2025-03-13 12:50:07 +01:00
net Bluetooth: L2CAP: accept zero as a special value for MTU auto-selection 2025-03-13 12:50:25 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-03-13 12:49:57 +01:00
scripts kconfig: fix memory leak in sym_warn_unmet_dep() 2025-03-13 12:50:14 +01:00
security tomoyo: don't emit warning in tomoyo_write_control() 2025-03-13 12:50:18 +01:00
sound ALSA: usb-audio: Add delay quirk for iBasso DC07 Pro 2025-03-13 12:50:15 +01:00
tools perf bench: Fix undefined behavior in cmpworker() 2025-03-13 12:50:26 +01:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-10-22 15:40:41 +02:00
.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 trace: Relocate event helper files 2024-04-10 16:19:24 +02:00
Makefile Linux 5.15.178 2025-02-01 18:24:02 +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.