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Olivier Bacon 91962adf06 crypto: engine - fix crypto_queue backlog handling 
[ Upstream commit 4140aafcff ]

CRYPTO_TFM_REQ_MAY_BACKLOG tells the crypto driver that it should
internally backlog requests until the crypto hw's queue becomes
full. At that point, crypto_engine backlogs the request and returns
-EBUSY. Calling driver such as dm-crypt then waits until the
complete() function is called with a status of -EINPROGRESS before
sending a new request.

The problem lies in the call to complete() with a value of -EINPROGRESS
that is made when a backlog item is present on the queue. The call is
done before the successful execution of the crypto request. In the case
that do_one_request() returns < 0 and the retry support is available,
the request is put back in the queue. This leads upper drivers to send
a new request even if the queue is still full.

The problem can be reproduced by doing a large dd into a crypto
dm-crypt device. This is pretty easy to see when using
Freescale CAAM crypto driver and SWIOTLB dma. Since the actual amount
of requests that can be hold in the queue is unlimited we get IOs error
and dma allocation.

The fix is to call complete with a value of -EINPROGRESS only if
the request is not enqueued back in crypto_queue. This is done
by calling complete() later in the code. In order to delay the decision,
crypto_queue is modified to correctly set the backlog pointer
when a request is enqueued back.

Fixes: 6a89f492f8 ("crypto: engine - support for parallel requests based on retry mechanism")
Co-developed-by: Sylvain Ouellet <souellet@genetec.com>
Signed-off-by: Sylvain Ouellet <souellet@genetec.com>
Signed-off-by: Olivier Bacon <obacon@genetec.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-05-17 13:58:53 +02:00
Documentation ASoC: dt-bindings: qcom,lpass-rx-macro: correct minItems for clocks 2023-05-11 23:10:55 +09:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
arch KVM: s390: fix race in gmap_make_secure() 2023-05-17 13:58:50 +02:00
block block: Skip destroyed blkg when restart in blkg_destroy_all() 2023-05-17 13:58:45 +02:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-01-31 17:53:01 +09:00
crypto crypto: engine - fix crypto_queue backlog handling 2023-05-17 13:58:53 +02:00
drivers crypto: sun8i-ss - Fix a test in sun8i_ss_setup_ivs() 2023-05-17 13:58:53 +02:00
fs rxrpc: Fix timeout of a call that hasn't yet been granted a channel 2023-05-17 13:58:47 +02:00
include crypto: api - Add scaffolding to change completion function signature 2023-05-17 13:58:53 +02:00
init gcc: disable '-Warray-bounds' for gcc-13 too 2023-04-26 14:30:08 +02:00
io_uring io_uring/rsrc: use nospec'ed indexes 2023-05-11 23:11:15 +09:00
ipc Non-MM patches for 6.2-rc1. 2022-12-12 17:28:58 -08:00
kernel kcsan: Avoid READ_ONCE() in read_instrumented_memory() 2023-05-11 23:11:34 +09:00
lib debugobject: Ensure pool refill (again) 2023-05-11 23:11:36 +09:00
mm mm/mempolicy: correctly update prev when policy is equal on mbind 2023-05-11 23:11:35 +09:00
net af_packet: Don't send zero-byte data in packet_sendmsg_spkt(). 2023-05-17 13:58:49 +02:00
rust rust: kernel: Mark rust_fmt_argument as extern "C" 2023-04-26 14:30:02 +02:00
samples ftrace: Export ftrace_free_filter() to modules 2023-01-24 11:20:58 -05:00
scripts scripts/gdb: fix lx-timerlist for Python3 2023-05-11 23:11:34 +09:00
security selinux: ensure av_permissions.h is built when needed 2023-05-11 23:10:56 +09:00
sound ALSA: caiaq: input: Add error handling for unsupported input methods in `snd_usb_caiaq_input_init` 2023-05-17 13:58:50 +02:00
tools perf cs-etm: Fix timeless decode mode detection 2023-05-17 13:58:53 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Register /dev/kvm as the _very_ last thing during initialization 2023-03-10 09:29:33 +01:00
.clang-format iommufd for 6.2 2022-12-14 09:15:43 -08:00
.cocciconfig
…
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore *.rpm 2022-12-30 17:22:14 +09:00
.mailmap 12 hotfixes, mostly against mm/. Five of these fixes are cc:stable. 2023-02-13 14:09:20 -08:00
.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: update SCTP maintainers 2023-02-02 11:35:33 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS audit: update the mailing list in MAINTAINERS 2023-02-25 11:13:29 +01:00
Makefile Linux 6.2.15 2023-05-11 23:11:36 +09:00
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.