WSL2-Linux-Kernel

The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)

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Alan Stern 0284c0ca3d USB: core: Fix bug in resuming hub's handling of wakeup requests commit `0f663729bb` upstream. Bugzilla #213839 reports a 7-port hub that doesn't work properly when devices are plugged into some of the ports; the kernel goes into an unending disconnect/reinitialize loop as shown in the bug report. This "7-port hub" comprises two four-port hubs with one plugged into the other; the failures occur when a device is plugged into one of the downstream hub's ports. (These hubs have other problems too. For example, they bill themselves as USB-2.0 compliant but they only run at full speed.) It turns out that the failures are caused by bugs in both the kernel and the hub. The hub's bug is that it reports a different bmAttributes value in its configuration descriptor following a remote wakeup (0xe0 before, 0xc0 after -- the wakeup-support bit has changed). The kernel's bug is inside the hub driver's resume handler. When hub_activate() sees that one of the hub's downstream ports got a wakeup request from a child device, it notes this fact by setting the corresponding bit in the hub->change_bits variable. But this variable is meant for connection changes, not wakeup events; setting it causes the driver to believe the downstream port has been disconnected and then connected again (in addition to having received a wakeup request). Because of this, the hub driver then tries to check whether the device currently plugged into the downstream port is the same as the device that had been attached there before. Normally this check succeeds and wakeup handling continues with no harm done (which is why the bug remained undetected until now). But with these dodgy hubs, the check fails because the config descriptor has changed. This causes the hub driver to reinitialize the child device, leading to the disconnect/reinitialize loop described in the bug report. The proper way to note reception of a downstream wakeup request is to set a bit in the hub->event_bits variable instead of hub->change_bits. That way the hub driver will realize that something has happened to the port but will not think the port and child device have been disconnected. This patch makes that change. Cc: <stable@vger.kernel.org> Tested-by: Jonathan McDowell <noodles@earth.li> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/YdCw7nSfWYPKWQoD@rowland.harvard.edu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-01-16 09:12:43 +01:00
Documentation	Input: i8042 - add deferred probe support	2022-01-05 12:42:32 +01:00
LICENSES	…
arch	ARM: dts: exynos: Fix BCM4330 Bluetooth reset polarity in I9100	2022-01-16 09:12:43 +01:00
block	iocost: Fix divide-by-zero on donation from low hweight cgroup	2021-12-22 09:32:48 +01:00
certs	…
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-18 19:16:44 +01:00
drivers	USB: core: Fix bug in resuming hub's handling of wakeup requests	2022-01-16 09:12:43 +01:00
fs	fget: clarify and improve __fget_files() implementation	2022-01-16 09:12:42 +01:00
include	fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb	2022-01-11 15:35:16 +01:00
init	init: make unknown command line param message clearer	2021-11-18 19:17:11 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-25 09:48:42 +01:00
kernel	bpf: Fix out of bounds access from invalid *_or_null type verification	2022-01-16 09:12:41 +01:00
lib	siphash: use _unaligned version by default	2021-12-08 09:04:47 +01:00
mm	mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'	2022-01-05 12:42:39 +01:00
net	ipv6: raw: check passed optlen before reading	2022-01-11 15:35:18 +01:00
samples	ftrace/samples: Add missing prototypes direct functions	2022-01-11 15:35:13 +01:00
scripts	recordmcount.pl: fix typo in s390 mcount regex	2022-01-05 12:42:33 +01:00
security	selinux: initialize proto variable in selinux_ip_postroute_compat()	2022-01-05 12:42:34 +01:00
sound	ALSA: hda: intel-sdw-acpi: go through HDAS ACPI at max depth of 2	2022-01-05 12:42:33 +01:00
tools	userfaultfd/selftests: fix hugetlb area allocations	2022-01-11 15:35:18 +01:00
usr	…
virt	KVM: downgrade two BUG_ONs to WARN_ON_ONCE	2021-12-22 09:32:34 +01:00
.clang-format	…
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	…
.gitignore	…
.mailmap	…
COPYING	…
CREDITS	…
Kbuild	…
Kconfig	…
MAINTAINERS	drm fixes for 5.15 final	2021-10-28 12:17:01 -07:00
Makefile	Linux 5.15.14	2022-01-11 15:35:19 +01:00
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.