From: Julian Wiedmann Date: Wed, 17 Jun 2020 13:30:14 +0000 (+0200) Subject: s390/qdio: allow to scan all 128 Input SBALs X-Git-Tag: v5.9-rc1~211^2~21 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2bbf282a5e8e7e6b36586718b484a36117b6b8a0;p=thirdparty%2Flinux.git 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: Julian Wiedmann Signed-off-by: Heiko Carstens --- diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index d4c699773070f..0c1f186c62913 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -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;