This is 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
Rework on the review comments by Arnd w.r.t. v1 for patch 2:
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.
Binoy Jayan (2):
staging: wilc1000: message_queue: Move code to host interface
staging: wilc1000: Replace kthread with workqueue for host interface
drivers/staging/wilc1000/Makefile | 1 -
drivers/staging/wilc1000/TODO | 5 +
drivers/staging/wilc1000/host_interface.c | 417 +++++++++++++++---------------
drivers/staging/wilc1000/wilc_msgqueue.c | 144 -----------
drivers/staging/wilc1000/wilc_msgqueue.h | 28 --
5 files changed, 216 insertions(+), 379 deletions(-)
delete mode 100644 drivers/staging/wilc1000/wilc_msgqueue.c
delete mode 100644 drivers/staging/wilc1000/wilc_msgqueue.h
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