Commit 2bbf282a authored by Julian Wiedmann's avatar Julian Wiedmann Committed by Heiko Carstens
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s390/qdio: allow to scan all 128 Input SBALs 



The comment is inaccurate, qdio_inbound_q_moved() and/or its callers no
longer get confused by a count of 128 completed SBALs.

Scanning all 128 SBALs at once can improve IRQ reduction (as we now
place the ACK at the right spot), and reduce the amount of processing
needed to handle all completed SBALs.

Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 529683d4

drivers/s390/cio/qdio_main.c

+1 −5
Original line number Diff line number Diff line
@@ -457,11 +457,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) 


	q->timestamp = get_tod_clock_fast();



	/*

	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved

	 * would return 0.

	 */

	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);

	count = atomic_read(&q->nr_buf_used);

	if (!count)

		return 0;