linux-kernel - [PATCH v4 0/3] Media Device Allocator API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <cover.1479271294.git.shuahkh@osg.samsung.com>
Date:   Wed, 16 Nov 2016 07:29:08 -0700
From:   Shuah Khan <shuahkh@....samsung.com>
To:     mchehab@...nel.org, perex@...ex.cz, tiwai@...e.com,
        hans.verkuil@...co.com, javier@....samsung.com,
        chehabrafael@...il.com, g.liakhovetski@....de, ONeukum@...e.com,
        k@...w.org, daniel@...que.org, mahasler@...il.com,
        clemens@...isch.de, geliangtang@....com, vdronov@...hat.com,
        laurent.pinchart@...asonboard.com
Cc:     Shuah Khan <shuahkh@....samsung.com>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH v4 0/3] Media Device Allocator API 

Media Device Allocator API to allows multiple drivers share a media device.
Using this API, drivers can allocate a media device with the shared struct
device as the key. Once the media device is allocated by a driver, other
drivers can get a reference to it. The media device is released when all
the references are released.

Patches 0001 and 0002 are rebased to 4.9-rc4. Patch 0003 for snd-usb-audio
is a rebase of the patch that was tested with the original Media Device
Allocator patch series.

snd-usb-audio patch includes the fixes found during 4.7-rc1 time in the
original snd-usb-audio patch.

Changes to patch 0001 since v3:
- Fixed undefined reference to `__media_device_usb_init compile error when
  CONFIG_USB is disabled.
- Fixed kernel paging error when accessing /dev/mediaX after rmmod of the
  module that owns the media_device. The fix bumps the reference count for
  the owner when second driver comes along to share the media_device. If
  au0828 owns the media_device, then snd_usb_audio will bump the refcount
  for au0828, so it won't get deleted and vice versa.

Changes to patch 0002 since v2:
- Updated media_device_delete() to pass in module name.

Changes to patch 0003 since the last version in 4.7-rc1:
- Included fixes to bugs found during testing. 
- Updated to use the Media Allocator API.

This patch series has been tested with au0828 and snd-usb-audio drivers.
Ran bind and unbind loop tests on each driver with mc_nextgen_test and
media_device_test app loop tests while checking lsmod and dmesg.

Please refer to tools/testing/selftests/media_tests/regression_test.txt
for testing done on this series.

Shuah Khan (3):
  media: Media Device Allocator API
  media: change au0828 to use Media Device Allocator API
  sound/usb: Use Media Controller API to share media resources

 drivers/media/Makefile                 |   3 +-
 drivers/media/media-dev-allocator.c    | 146 +++++++++++++++
 drivers/media/usb/au0828/au0828-core.c |  12 +-
 drivers/media/usb/au0828/au0828.h      |   1 +
 include/media/media-dev-allocator.h    |  87 +++++++++
 sound/usb/Kconfig                      |   4 +
 sound/usb/Makefile                     |   2 +
 sound/usb/card.c                       |  14 ++
 sound/usb/card.h                       |   3 +
 sound/usb/media.c                      | 314 +++++++++++++++++++++++++++++++++
 sound/usb/media.h                      |  73 ++++++++
 sound/usb/mixer.h                      |   3 +
 sound/usb/pcm.c                        |  28 ++-
 sound/usb/quirks-table.h               |   1 +
 sound/usb/stream.c                     |   2 +
 sound/usb/usbaudio.h                   |   6 +
 16 files changed, 685 insertions(+), 14 deletions(-)
 create mode 100644 drivers/media/media-dev-allocator.c
 create mode 100644 include/media/media-dev-allocator.h
 create mode 100644 sound/usb/media.c
 create mode 100644 sound/usb/media.h

-- 
2.7.4