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| 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 /include/asm-s390 | |
| parent | [S390] cio: change confusing message in cmf. (diff) | |
| download | linux-dev-f276730f8da0e8136d8491b6ef44fc719d450a1b.tar.xz linux-dev-f276730f8da0e8136d8491b6ef44fc719d450a1b.zip | |
[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 'include/asm-s390')
0 files changed, 0 insertions, 0 deletions