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Xu Yang 01120b22c5 usb: gadget: uvc: fix req_payload_size calculation 
commit 2edc1acb1a upstream.

Current req_payload_size calculation has 2 issue:

(1) When the first time calculate req_payload_size for all the buffers,
    reqs_per_frame = 0 will be the divisor of DIV_ROUND_UP(). So
    the result is undefined.
    This happens because VIDIOC_STREAMON is always executed after
    VIDIOC_QBUF. So video->reqs_per_frame will be 0 until VIDIOC_STREAMON
    is run.

(2) The buf->req_payload_size may be bigger than max_req_size.

    Take YUYV pixel format as example:
    If bInterval = 1, video->interval = 666666, high-speed:
    video->reqs_per_frame = 666666 / 1250 = 534
     720p: buf->req_payload_size = 1843200 / 534 = 3452
    1080p: buf->req_payload_size = 4147200 / 534 = 7766

    Based on such req_payload_size, the controller can't run normally.

To fix above issue, assign max_req_size to buf->req_payload_size when
video->reqs_per_frame = 0. And limit buf->req_payload_size to
video->req_size if it's large than video->req_size. Since max_req_size
is used at many place, add it to struct uvc_video and set the value once
endpoint is enabled.

Fixes: 98ad032915 ("usb: gadget: uvc: set req_length based on payload by nreqs instead of req_size")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://patch.msgid.link/20260113-uvc-gadget-fix-patch-v2-1-62950ef5bcb5@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-01-23 11:21:27 +01:00
arch x86/kaslr: Recognize all ZONE_DEVICE users as physaddr consumers 2026-01-23 11:21:25 +01:00
block block: zero non-PI portion of auto integrity buffer 2026-01-23 11:21:16 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: seqiv - Do not use req->iv after crypto_aead_encrypt 2026-01-08 10:16:43 +01:00
Documentation dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets 2026-01-02 12:57:27 +01:00
drivers usb: gadget: uvc: fix req_payload_size calculation 2026-01-23 11:21:27 +01:00
fs xfs: Fix the return value of xfs_rtcopy_summary() 2026-01-23 11:21:25 +01:00
include ALSA: pcm: Improve the fix for race of buffer access at PCM OSS layer 2026-01-23 11:21:23 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring: move local task_work in exit cancel loop 2026-01-23 11:21:13 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel ftrace: Do not over-allocate ftrace memory 2026-01-23 11:21:25 +01:00
lib lib/buildid: use __kernel_read() for sleepable context 2026-01-23 11:21:25 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm x86/kaslr: Recognize all ZONE_DEVICE users as physaddr consumers 2026-01-23 11:21:25 +01:00
net net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts 2026-01-23 11:21:24 +01:00
rust rust: bitops: fix missing _find_* functions on 32-bit ARM 2026-01-23 11:21:12 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts mcb: Add missing modpost build support 2026-01-08 10:16:47 +01:00
security landlock: Fix wrong type usage 2026-01-23 11:21:22 +01:00
sound ALSA: hda/realtek: Add quirk for HP Pavilion x360 to enable mute LED 2026-01-23 11:21:24 +01:00
tools tools/testing/selftests: fix gup_longterm for unknown fs 2026-01-23 11:21:25 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Fix last_boosted_vcpu index assignment bug 2026-01-02 12:57:21 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.6 2026-01-17 16:35:34 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.