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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2006-07-27 12:00:23 (GMT)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-07-27 12:00:23 (GMT)
commitba4ba8a69dcb446450b5ddeca48a7bd15783f4c2 (patch)
treee923e6f55126c25b2411462748435ca882bf0027 /drivers
parent64821324ca49f24be1a66f2f432108f96a24e596 (diff)
[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')
-rw-r--r--drivers/s390/cio/device_fsm.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index ac6e0c7..7a39e0b 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. */

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