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s390/qdio: restrict buffer merging to eligible devices 

Only attempt to merge PENDING into EMPTY buffers for devices where
the PENDING state is actually expected (ie. IQD with CQ).
This might speed up the hot path a little bit.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Julian Wiedmann 2018-03-07 14:19:43 +01:00 committed by Martin Schwidefsky
parent 0cf1e05157
commit c11a3dfd6f
1 changed files with 2 additions and 1 deletions
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3
drivers/s390/cio/qdio_main.c
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@ -761,7 +761,8 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
if (!count)
goto out;
count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
count = get_buf_states(q, q->first_to_check, &state, count, 0,
q->u.out.use_cq);
if (!count)
goto out;