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authorFrank Pavlic <fpavlic@de.ibm.com>2007-07-17 13:36:04 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-07-17 13:36:18 +0200
commit6cbed91ab78e750eef2dacb75bd51bd63792fd07 (patch)
treeb7fae0e398d677e1b1e155c758a5af82387c17c1
parent92d154b6c54f76016d36a7eb4aab6eea27737fdb (diff)
[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 <fpavlic@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/cio/qdio.c4
1 files 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);