Hi Tejun, James,
While trying to use drain_workqueue() in libsas I hit the
WARN_ON_ONCE(!is_chained_work(wq)) in __queue_work(). However, as I
mention in patch-2 libsas expects that new unchained work can be
submitted during a drain. So, patch-2 is a hack to accept new work when
drain_workqueue() is used publicly as a "stronger flush", while keeping
the same warn+drop behavior for internal usages of drain_workqueue() in
the destroy_workqueue() case.
Smoke tested on sas topoloogy of:
host-->ata
host-->expander-->ata
host-->expander-->expander-->ata
--
Dan
---
Dan Williams (3):
workqueue: promote workqueue_lock to hard-irq safe
workqueue: defer work to a draining queue
scsi: use drain_workqueue
drivers/scsi/hosts.c | 8 ++-
drivers/scsi/isci/host.c | 3 -
include/linux/workqueue.h | 3 +
include/scsi/scsi_host.h | 2 -
kernel/workqueue.c | 114 ++++++++++++++++++++++++++++++++-------------
5 files changed, 89 insertions(+), 41 deletions(-)
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