From 6cbed91ab78e750eef2dacb75bd51bd63792fd07 Mon Sep 17 00:00:00 2001 From: Frank Pavlic Date: Tue, 17 Jul 2007 13:36:04 +0200 Subject: [S390] qdio: output queue stall on FCP and network devices When running QIOASSIST enabled qdio devices in a z/VM environment the output queue for such devices stall in heavy workload situations. When SQBS and EQBS instructions returns CCQ=96 qdio does not reissue the instruction again with the register settings done by millicode but processed the returned qdio buffer. This is wrong. qdio has to reissue the instruction once again on CCQ=96, as we already do it for CCQ=97. Signed-off-by: Frank Pavlic Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/qdio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index e70aeb7a378..ae437322c9c 100644 --- a/drivers/s390/cio/qdio.c +++ b/drivers/s390/cio/qdio.c @@ -166,9 +166,9 @@ qdio_check_ccq(struct qdio_q *q, unsigned int ccq) { char dbf_text[15]; - if (ccq == 0 || ccq == 32 || ccq == 96) + if (ccq == 0 || ccq == 32) return 0; - if (ccq == 97) + if (ccq == 96 || ccq == 97) return 1; /*notify devices immediately*/ sprintf(dbf_text,"%d", ccq); -- cgit v1.2.3