diff options
| author | Klaus D. Wacker <kdwacker@de.ibm.com> | 2007-08-22 13:51:38 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-08-22 13:51:47 +0200 |
| commit | f276730f8da0e8136d8491b6ef44fc719d450a1b (patch) | |
| tree | ac6d0545d41e5c70c7c3c5c84c9a9c4fae7f7919 /drivers/s390 | |
| parent | 23eb68c569cdbaad1a88015be1d69c565cd3926a (diff) | |
| download | linux-f276730f8da0e8136d8491b6ef44fc719d450a1b.tar.bz2 | |
[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.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, 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; |