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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2006-07-27 14:00:23 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-07-27 14:00:23 +0200 |
| commit | ba4ba8a69dcb446450b5ddeca48a7bd15783f4c2 (patch) | |
| tree | e923e6f55126c25b2411462748435ca882bf0027 /drivers/s390 | |
| parent | 64821324ca49f24be1a66f2f432108f96a24e596 (diff) | |
| download | linux-next-ba4ba8a69dcb446450b5ddeca48a7bd15783f4c2.tar.gz | |
[S390] permanent subchannel busy conditions may cause I/O stall
In special conditions where a subchannel rejects the HALT I/O-
instruction with a busy indication (cc 2), I/O may stall.
I/O request termination logic retries HALT I/O indefinitely
because it expects HALT I/O to alter the subchannel status which
is not true when cc 2 is returned.
In case of a busy indication, try CLEAR I/O instruction immediately.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/device_fsm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index ac6e0c7e43d9..7a39e0b0386c 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -152,7 +152,8 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev) if (cdev->private->iretry) { cdev->private->iretry--; ret = cio_halt(sch); - return (ret == 0) ? -EBUSY : ret; + if (ret != -EBUSY) + return (ret == 0) ? -EBUSY : ret; } /* halt io unsuccessful. */ cdev->private->iretry = 255; /* 255 clear retries. */ |