[PATCH v3 0/3] *** staging: wilc1000: Replace semaphores ***

From: Binoy Jayan
Date: Wed Jun 22 2016 - 06:03:54 EST


This patchset [v3] is part of the second patch series for 'wilc1000'.
The original patch series consisted 7 patches of which only the first 5
are good. The patch 6 and 7 are being worked on in this series
in a different way.

This patch series removes the semaphore 'sem' in 'wilc1000' and also
restructures the implementation of kthread / message_queue logic with
a create_singlethread_workqueue() / queue_work() setup.

These are part of a bigger effort to eliminate all semaphores
from the linux kernel.

They build correctly (individually and as a whole).

NB: The changes are untested

Discussion carried forward from previous patchset [v2]

Rework on the review comments by Arnd w.r.t. v1

struct message_queue can be removed since
- after the workqueue conversion, mq->sem is no longer needed
- recv_count is not needed, it just counts the number of entries in the list
- struct wilc' pointer can be retrieved from the host_if_msg, (vif->wilc)
- the message list is not needed because we always look only at the
first entry, except in wilc_mq_destroy(), but it would be better
to just call destroy_workqueue(), which also drains the remaining work.
- the exiting flag is also handled by destroy_workqueue()
- with everything else gone, the spinlock is also not needed any more.

Do 'kfree' only at the end of 'host_if_work'

wilc_initialized is always '1' so the conditional 'wilc_mq_send'
in 'hostIFthread' can be removed.

A connect command (HOST_IF_MSG_CONNECT) does not complete while scan is ongoing.
So, the special handling of this command needs to be preserved.

Use create_singlethread_workqueue() instead of alloc_workqueue(), so that
we stay closer to the current behavior by having the thread run only
on one CPU at a time and not having a 'dedicated' thread for each.

Split the patch to seperate interface changes to 'wilc_mq_send'
No easy way found to split the patch to change the interface
'wilc_mq_send' and to 'wilc_enqueue_cmd' as the parameters
'mq' 'send_buf' and 'send_buf_size' itself are part of the message
queue implementation.

New changes in v3

Rework on the review comments by Arnd w.r.t. v2
- Removed forward declaration for wilc_enqueue_cmd
- Change the interface 'wilc_mq_send' in a different patch
- Avoid change in indentation in host_if_work and move it to
a different patch

Cannot remove forward declaraition for 'host_if_work'
since there is a mutual dependency.

Binoy

Binoy Jayan (3):
staging: wilc1000: message_queue: Move code to host interface
staging: wilc1000: Replace kthread with workqueue for host interface
staging: wilc1000: Change interface wilc_mq_send to wilc_enqueue_cmd

drivers/staging/wilc1000/Makefile | 1 -
drivers/staging/wilc1000/TODO | 5 +
drivers/staging/wilc1000/host_interface.c | 395 +++++++++++++++---------------
drivers/staging/wilc1000/wilc_msgqueue.c | 144 -----------
drivers/staging/wilc1000/wilc_msgqueue.h | 28 ---
5 files changed, 204 insertions(+), 369 deletions(-)
delete mode 100644 drivers/staging/wilc1000/wilc_msgqueue.c
delete mode 100644 drivers/staging/wilc1000/wilc_msgqueue.h

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