tree a2f7b323eff54290c57c0b04f30377d4024c0877
parent 941f8d55f6d613a460a5e080d25a38509f45eb75
author Santosh Shilimkar <santosh.shilimkar@oracle.com> 1475172431 -0700
committer Santosh Shilimkar <santosh.shilimkar@oracle.com> 1483394575 -0800

RDS: IB: fix panic due to handlers running post teardown

Shutdown code reaping loop takes care of emptying the
CQ's before they being destroyed. And once tasklets are
killed, the hanlders are not expected to run.

But because of core tasklet code issues, tasklet handler could
still run even after tasklet_kill,
RDS IB shutdown code already reaps the CQs before freeing
cq/qp resources so as such the handlers have nothing left
to do post shutdown.

On other hand any handler running after teardown and trying
to access already freed qp/cq resources causes issues
Patch fixes this race by  makes sure that handlers returns
without any action post teardown.

Reviewed-by: Wengang <wen.gang.wang@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>