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authorJulian Wiedmann <jwi@linux.ibm.com>2020-06-17 16:30:14 +0300
committerHeiko Carstens <hca@linux.ibm.com>2020-07-20 11:55:22 +0300
commit2bbf282a5e8e7e6b36586718b484a36117b6b8a0 (patch)
tree6cad0b850638a7f616fffeca2eb54a5fbdcd21ec /drivers/s390
parent529683d4705b6b1fa1c2f902e859ad6a8d17e31e (diff)
downloadlinux-2bbf282a5e8e7e6b36586718b484a36117b6b8a0.tar.xz
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 <jwi@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/qdio_main.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index d4c699773070..0c1f186c6291 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;