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Giacomo Guiduzzi 7a378016d6 ALSA: pci: fix reading of swapped values from pcmreg in AC97 codec 
commit 17aaf01933 upstream.

Tests 72 and 78 for ALSA in kselftest fail due to reading
inconsistent values from some devices on a VirtualBox
Virtual Machine using the snd_intel8x0 driver for the AC'97
Audio Controller device.
Taking for example test number 72, this is what the test reports:
"Surround Playback Volume.0 expected 1 but read 0, is_volatile 0"
"Surround Playback Volume.1 expected 0 but read 1, is_volatile 0"
These errors repeat for each value from 0 to 31.

Taking a look at these error messages it is possible to notice
that the written values are read back swapped.
When the write is performed, these values are initially stored in
an array used to sanity-check them and write them in the pcmreg
array. To write them, the two one-byte values are packed together
in a two-byte variable through bitwise operations: the first
value is shifted left by one byte and the second value is stored in the
right byte through a bitwise OR. When reading the values back,
right shifts are performed to retrieve the previously stored
bytes. These shifts are executed in the wrong order, thus
reporting the values swapped as shown above.

This patch fixes this mistake by reversing the read
operations' order.

Signed-off-by: Giacomo Guiduzzi <guiduzzi.giacomo@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220322200653.15862-1-guiduzzi.giacomo@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-28 10:03:20 +02:00
arch Fix for the SLS mitigation, which makes a "SETcc/RET" pair grow to 2022-03-20 09:46:52 -07:00
block block: release rq qos structures for queue without disk 2022-03-14 14:05:41 -06:00
certs
crypto crypto: af_alg - get rid of alg_memory_allocated 2022-02-15 14:29:04 +00:00
Documentation ARM: SoC fixes for 5.17, part 3 2022-03-10 11:43:01 -08:00
drivers Bluetooth: btusb: Add another Realtek 8761BU 2022-03-28 10:03:18 +02:00
fs fix for regression in multiuser mount parm 2022-03-18 12:22:15 -07:00
include ALSA: pcm: Fix races among concurrent hw_params and hw_free calls 2022-03-28 10:03:19 +02:00
init
ipc
kernel configs/debug: restore DEBUG_INFO=y for overriding 2022-03-17 11:02:13 -07:00
lib ARM further fixes for 5.17-rc: 2022-03-02 16:11:56 -08:00
LICENSES
mm mm: swap: get rid of livelock in swapin readahead 2022-03-17 11:02:13 -07:00
net llc: fix netdevice reference leaks in llc_ui_bind() 2022-03-28 10:03:18 +02:00
samples samples/seccomp: Adjust sample to also provide kill option 2022-02-10 19:09:12 -08:00
scripts kconfig: fix failing to generate auto.conf 2022-02-12 23:24:19 +09:00
security selinux/stable-5.17 PR 20220223 2022-02-23 17:19:55 -08:00
sound ALSA: pci: fix reading of swapped values from pcmreg in AC97 codec 2022-03-28 10:03:20 +02:00
tools perf parse-events: Ignore case in topdown.slots check 2022-03-18 18:39:09 -03:00
usr
virt KVM: Fix lockdep false negative during host resume 2022-02-17 09:52:50 -05:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild
Kconfig
MAINTAINERS Add Paolo Abeni to networking maintainers 2022-03-15 12:16:10 -07:00
Makefile Linux 5.17 2022-03-20 13:14:17 -07:00
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.