[PATCH v5 0/5] firmware: encapsulate firmware loading status

[Daniel Wagner <wagi@monom.org>]

From: Daniel Wagner <daniel.wagner@bmw-carit.de>

Hi,

The firmware user helper code tracks the current state of the loading
process via an member of struct firmware_buf and a completion. Let's
encapsulate this simple state machine into struct fw_status. The aim is
to increase readability and reduce the usage of the fw_lock.

Luis asked by to add a few CC for getting a wider audience. If you
haven't seen this before the initial version of this series has some
more details on the motivation for this series:

http://www.spinics.net/lists/linux-wireless/msg153005.html

I tested this series with fw_userhelper.sh and fw_filesystem.sh under
kvm and also let it run on real hardware. The series is also available
here:

https://git.kernel.org/cgit/linux/kernel/git/wagi/linux.git/log/?h=firmware_async-7

I had pushed earlier version of series there and haven't got any 0-day
bug reports so far.

cheers,
daniel

This series depends on Luis' "firmware: add SmPL grammar to avoid issues"
series:

http://marc.info/?l=linux-kernel&m=147320896231418&w=2

changes since v4:
  - replaced "firmware: Move umh locking code into fw_load_from_user_helper()"
    with "firmware: document user mode helper lock usage"
  - changed prefix fw_status_ to fw_umh_
  - fixed a couple of bux pointed out by Ming
  - changed type of fw_umh::status to u8 and updated commit message to
    point out that all states are exclusive
    

changes since v3:
  - added 'firmware: Move umh locking code into
    fw_load_from_user_helper()'
  - dropped loading_tiemout and firmware_loading_time() for
    !CONFG_FW_LOADER_USER_HELPER
  - rebased on Luis patches

changes since v2:
  - more splitting out
    - first patch factors out all the bit ops into fw_status
    - second patch gets rid of the bit ops
    - third get rid of fw_lock by using swait

changes since v1:
  - moved swait change into its own patch
  - added ifdef section for FW_LOADER_USER_HELPER_FALLBACK
  - updated commit message highlighting the mutex usage drop a bit

  https://lkml.org/lkml/2016/8/4/239

Daniel Wagner (5):
  firmware: document user mode helper lock usage
  firmware: encapsulate firmware loading status
  firmware: rename fw_load_from_user_helper() and
    _request_firmware_load()
  firmware: drop bit ops in favor of simple state machine
  firmware: do not use fw_lock for fw_umh protection

 drivers/base/firmware_class.c | 194 +++++++++++++++++++++++++-----------------
 1 file changed, 118 insertions(+), 76 deletions(-)

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2.7.4