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commit 8004d635f27bbccaa5c083c50d4d5302a6ffa00e upstream. This reverts commit 3dd075fe8ebbc6fcbf998f81a75b8c4b159a6195. 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: 3dd075fe8ebb ("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>
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.