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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Maximilian Luz 25b5f693bc platform/surface: aggregator: Ignore command messages not intended for us 
commit ae0fa0a312 upstream.

It is possible that we (the host/kernel driver) receive command messages
that are not intended for us. Ignore those for now.

The whole story is a bit more complicated: It is possible to enable
debug output on SAM, which is sent via SSH command messages. By default
this output is sent to a debug connector, with its own target ID
(TID=0x03). It is possible to override the target of the debug output
and set it to the host/kernel driver. This, however, does not change the
original target ID of the message. Meaning, we receive messages with
TID=0x03 (debug) but expect to only receive messages with TID=0x00
(host).

The problem is that the different target ID also comes with a different
scope of request IDs. In particular, these do not follow the standard
event rules (i.e. do not fall into a set of small reserved values).
Therefore, current message handling interprets them as responses to
pending requests and tries to match them up via the request ID. However,
these debug output messages are not in fact responses, and therefore
this will at best fail to find the request and at worst pass on the
wrong data as response for a request.

Therefore ignore any command messages not intended for us (host) for
now. We can implement support for the debug messages once we have a
better understanding of them.

Note that this may also provide a bit more stability and avoid some
driver confusion in case any other targets want to talk to us in the
future, since we don't yet know what to do with those as well. A warning
for the dropped messages should suffice for now and also give us a
chance of discovering new targets if they come along without any
potential for bugs/instabilities.

Fixes: c167b9c7e3 ("platform/surface: Add Surface Aggregator subsystem")
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20221202223327.690880-2-luzmaximilian@gmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2023-01-18 11:48:50 +01:00
Documentation docs: Fix the docs build with Sphinx 6.0 2023-01-18 11:48:48 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch s390/percpu: add READ_ONCE() to arch_this_cpu_to_op_simple() 2023-01-18 11:48:49 +01:00
block block: don't allow splitting of a REQ_NOWAIT bio 2023-01-12 11:59:18 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: tcrypt - Fix multibuffer skcipher speed test mem leak 2022-12-31 13:14:24 +01:00
drivers platform/surface: aggregator: Ignore command messages not intended for us 2023-01-18 11:48:50 +01:00
fs cifs: Fix uninitialized memory read for smb311 posix symlink create 2023-01-18 11:48:49 +01:00
include efi: tpm: Avoid READ_ONCE() for accessing the event log 2023-01-18 11:48:48 +01:00
init init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash 2022-12-02 17:41:08 +01:00
io_uring io_uring: Fix unsigned 'res' comparison with zero in io_fixup_rw_res() 2023-01-12 11:59:20 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel tracing: Fix issue of missing one synthetic field 2023-01-12 11:59:03 +01:00
lib overflow: Implement size_t saturating arithmetic helpers 2022-12-31 13:14:33 +01:00
mm mm, compaction: fix fast_isolate_around() to stay within boundaries 2023-01-12 11:58:47 +01:00
net netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits 2023-01-18 11:48:46 +01:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2022-12-31 13:14:31 +01:00
scripts scripts/faddr2line: Fix regression in name resolution on ppc64le 2022-12-08 11:28:38 +01:00
security device_cgroup: Roll back to original exceptions after copy failure 2023-01-12 11:58:59 +01:00
sound ASoC: qcom: lpass-cpu: Fix fallback SD line index handling 2023-01-18 11:48:48 +01:00
tools perf auxtrace: Fix address filter duplicate symbol selection 2023-01-18 11:48:48 +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: Add support for arch compat vm ioctls 2022-10-29 10:12:54 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
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.get_maintainer.ignore
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.gitattributes
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.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING
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CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild
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Kconfig
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MAINTAINERS futex: Move to kernel/futex/ 2022-12-31 13:14:04 +01:00
Makefile Linux 5.15.88 2023-01-14 10:23:29 +01:00
README
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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.