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Michal Pecio df4c0304f2 usb: core: Fix up Interrupt IN endpoints with bogus wBytesPerInterval commit `727d045d06` upstream. Tao Xue found that some common devices violate USB 3.x section 9.6.7 by reporting wBytesPerInterval lower than the size of packets they actually send. I confirmed that AX88179 may set it to 0 and RTL8153 CDC configuration sets it to 8 but sends both 8 and 16 byte packets: S Ii:11:007:3 -115:128 16 < C Ii:11:007:3 0:128 8 = a1000000 01000000 S Ii:11:007:3 -115:128 16 < C Ii:11:007:3 0:128 16 = a12a0000 01000800 00000000 00000000 Most xHCI host controllers neglect interrupt bandwidth reservations and let such devices exceed theirs, some fail the URB with EOVERFLOW. Assume that wBytesPerInterval lower than wMaxPacketSize is bogus and increase it to the worst case maximum on interrupt IN endpoints. This solves xHCI problems and appears to have no other effect. Interrupt transfers are not limited to one interval and drivers submit URBs of class defined size without looking at wBytesPerInterval. Any multi- interval transfer is considered terminated by a packet shorter than wMaxPacketSize regardless of wBytesPerInterval - see USB3 8.10.3. Stay in spec on OUT endpoints and isochronous. No buggy devices are known and we don't want to risk sending more data than the device is prepared to handle or confusing isoc drivers regarding altsetting capacities guaranteed by the device itself. And don't complain when wMaxPacketSize <= wBytesPerInterval < wMaxPacketSize * (bMaxBurst+1) because enabling this seems to be the exact goal of the spec. Reported-and-tested-by: Tao Xue <xuetao09@huawei.com> Closes: https://lore.kernel.org/linux-usb/20260402021400.28853-1-xuetao09@huawei.com/ Cc: stable@vger.kernel.org Signed-off-by: Michal Pecio <michal.pecio@gmail.com> Link: https://patch.msgid.link/20260518073207.5b7d26e7.michal.pecio@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2026-06-19 13:33:29 +02:00
arch	ARM: integrator: Fix early initialization	2026-06-01 17:35:49 +02:00
block	blk-mq: use quiesced elevator switch when reinitializing queues	2026-06-01 17:35:09 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: af_alg - Cap AEAD AD length to 0x80000000	2026-06-01 17:35:44 +02:00
Documentation	Documentation: fix a hugetlbfs reservation statement	2026-06-01 17:35:32 +02:00
drivers	usb: core: Fix up Interrupt IN endpoints with bogus wBytesPerInterval	2026-06-19 13:33:29 +02:00
fs	hpfs: fix a crash if hpfs_map_dnode_bitmap fails	2026-06-19 13:33:26 +02:00
include	xfrm: route MIGRATE notifications to caller's netns	2026-06-19 13:33:28 +02:00
init	init: handle bootloader identifier in kernel parameters	2025-10-19 16:21:45 +02:00
io_uring	io_uring: prevent opcode speculation	2026-06-01 17:35:45 +02:00
ipc	ipc: limit next_id allocation to the valid ID range	2026-06-19 13:33:26 +02:00
kernel	tracing: Avoid NULL return from hist_field_name() on truncation	2026-06-01 17:35:51 +02:00
lib	iommu, debugobjects: avoid gcc-16.1 section mismatch warnings	2026-06-19 13:33:28 +02:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm: blk-cgroup: fix use-after-free in cgwb_release_workfn()	2026-06-01 17:35:08 +02:00
net	xfrm: esp: restore combined single-frag length gate	2026-06-19 13:33:29 +02:00
samples	samples: mei: Fix building on musl libc	2025-08-28 16:24:07 +02:00
scripts	scripts/dtc: Remove unused dts_version in dtc-lexer.l	2026-06-01 17:35:12 +02:00
security	ima: check return value of crypto_shash_final() in boot aggregate	2026-06-01 17:35:34 +02:00
sound	ASoC: qcom: q6asm-dai: do not set stream state in event and trigger callbacks	2026-06-19 13:33:29 +02:00
tools	selftests: forwarding: lib: Add helpers for checksum handling	2026-06-19 13:33:24 +02:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-06-27 11:05:22 +01:00
virt	KVM: Reject wrapped offset in kvm_reset_dirty_gfn()	2026-06-01 17:35:44 +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	staging: rtl8712: Remove driver using deprecated API wext	2025-12-07 06:09:36 +09:00
Makefile	Linux 5.15.209	2026-06-01 17:35:51 +02:00
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.