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authorKlaus D. Wacker <kdwacker@de.ibm.com>2007-08-22 13:51:38 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-08-22 13:51:47 +0200
commitf276730f8da0e8136d8491b6ef44fc719d450a1b (patch)
treeac6d0545d41e5c70c7c3c5c84c9a9c4fae7f7919 /drivers/s390
parent23eb68c569cdbaad1a88015be1d69c565cd3926a (diff)
downloadop-kernel-dev-f276730f8da0e8136d8491b6ef44fc719d450a1b.zip
op-kernel-dev-f276730f8da0e8136d8491b6ef44fc719d450a1b.tar.gz
[S390] qdio: fix EQBS handling on CCQ96
QDIO returned from EQBS instruction in any case after return code CCQ=96 was issued regardless whether buffer states for at least one buffer were extracted or not. This caused FCP devices to hang when running under z/VM and having QIOASSASIST=ON and having high I/O rates. In order to fix this qdio return code processing of EQBS instruction after CCQ=96 is changed that buffers are returned and if no buffers where extracted the instruction is repeated at once. Signed-off-by: Klaus D. Wacker <kdwacker@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/qdio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 03347ae..badfb5b 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -195,6 +195,8 @@ qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
again:
ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt);
rc = qdio_check_ccq(q, ccq);
+ if ((ccq == 96) && (tmp_cnt != *cnt))
+ rc = 0;
if (rc == 1) {
QDIO_DBF_TEXT5(1,trace,"eqAGAIN");
goto again;
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