diff options
author | Klaus D. Wacker <kdwacker@de.ibm.com> | 2007-08-22 07:51:38 -0400 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-08-22 07:51:47 -0400 |
commit | f276730f8da0e8136d8491b6ef44fc719d450a1b (patch) | |
tree | ac6d0545d41e5c70c7c3c5c84c9a9c4fae7f7919 /drivers/s390/cio/qdio.c | |
parent | 23eb68c569cdbaad1a88015be1d69c565cd3926a (diff) |
[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/cio/qdio.c')
-rw-r--r-- | drivers/s390/cio/qdio.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index 03347aed2b3e..badfb5b21304 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, | |||
195 | again: | 195 | again: |
196 | ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt); | 196 | ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt); |
197 | rc = qdio_check_ccq(q, ccq); | 197 | rc = qdio_check_ccq(q, ccq); |
198 | if ((ccq == 96) && (tmp_cnt != *cnt)) | ||
199 | rc = 0; | ||
198 | if (rc == 1) { | 200 | if (rc == 1) { |
199 | QDIO_DBF_TEXT5(1,trace,"eqAGAIN"); | 201 | QDIO_DBF_TEXT5(1,trace,"eqAGAIN"); |
200 | goto again; | 202 | goto again; |