tree c615e96432df50f6606800832c9fc21f3ca61834
parent f3f6765fd0e8c32dd13c98329c8f48d0d98e4161
author Julian Wiedmann <jwi@linux.ibm.com> 1615308740 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1616659453 +0100

s390/qeth: schedule TX NAPI on QAOB completion

[ Upstream commit 3e83d467a08e25b27c44c885f511624a71c84f7c ]

When a QAOB notifies us that a pending TX buffer has been delivered, the
actual TX completion processing by qeth_tx_complete_pending_bufs()
is done within the context of a TX NAPI instance. We shouldn't rely on
this instance being scheduled by some other TX event, but just do it
ourselves.

qeth_qdio_handle_aob() is called from qeth_poll(), ie. our main NAPI
instance. To avoid touching the TX queue's NAPI instance
before/after it is (un-)registered, reorder the code in qeth_open()
and qeth_stop() accordingly.

Fixes: 0da9581ddb0f ("qeth: exploit asynchronous delivery of storage blocks")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>