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Taehee Yoo b795ceeed4 amt: use workqueue for gateway side message handling 
[ Upstream commit 30e22a6ebc ]

There are some synchronization issues(amt->status, amt->req_cnt, etc)
if the interface is in gateway mode because gateway message handlers
are processed concurrently.
This applies a work queue for processing these messages instead of
expanding the locking context.

So, the purposes of this patch are to fix exist race conditions and to make
gateway to be able to validate a gateway status more correctly.

When the AMT gateway interface is created, it tries to establish to relay.
The establishment step looks stateless, but it should be managed well.
In order to handle messages in the gateway, it saves the current
status(i.e. AMT_STATUS_XXX).
This patch makes gateway code to be worked with a single thread.

Now, all messages except the multicast are triggered(received or
delay expired), and these messages will be stored in the event
queue(amt->events).
Then, the single worker processes stored messages asynchronously one
by one.
The multicast data message type will be still processed immediately.

Now, amt->lock is only needed to access the event queue(amt->events)
if an interface is the gateway mode.

Fixes: cbc21dc1cf ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-07-29 17:28:09 +02:00
arch riscv: add as-options for modules with assembly compontents 2022-07-29 17:27:55 +02:00
block block: pop cached rq before potentially blocking rq_qos_throttle() 2022-06-29 09:04:33 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:28:03 +02:00
crypto crypto: memneq - move into lib/ 2022-06-22 14:28:06 +02:00
Documentation x86/bugs: Add retbleed=ibpb 2022-07-23 12:56:50 +02:00
drivers amt: use workqueue for gateway side message handling 2022-07-29 17:28:09 +02:00
fs ksmbd: use SOCK_NONBLOCK type for kernel_accept() 2022-07-22 10:21:46 +02:00
include amt: use workqueue for gateway side message handling 2022-07-29 17:28:09 +02:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-22 14:27:55 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:30:30 +02:00
kernel perf/core: Fix data race between perf_event_set_output() and perf_mmap_close() 2022-07-29 17:27:59 +02:00
lib ida: don't use BUG_ON() for debugging 2022-07-12 16:42:25 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/damon: use set_huge_pte_at() to make huge pte old 2022-07-22 10:21:19 +02:00
net net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering 2022-07-29 17:28:08 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:30:46 +02:00
scripts x86/retbleed: Add fine grained Kconfig knobs 2022-07-23 12:56:56 +02:00
security lockdown: Fix kexec lockdown bypass with ima policy 2022-07-29 17:27:55 +02:00
sound ALSA: usb-audio: Add quirk for Fiero SC-01 (fw v1.0.0) 2022-07-22 10:21:55 +02:00
tools perf tests: Fix Convert perf time to TSC test for hybrid 2022-07-29 17:28:03 +02:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-20 13:02:05 -04:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap hotfixes for 5.18-rc7 2022-05-13 10:22:37 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
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 MAINTAINERS: Remove iommu@lists.linux-foundation.org 2022-07-12 16:42:15 +02:00
Makefile Linux 5.18.14 2022-07-23 12:57:00 +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.