[S390] cio: fix quiesce state

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DEV_STATE_QUIESCE is used to stop all IO on a busy subchannel.
This patch fixes the following problems related to the QUIESCE
state:

* Fix a potential race condition which could occur when the
resulting state was DEV_STATE_OFFLINE.

* Add missing locking around cio_disable_subchannel,
ccw_device_cancel_halt_clear and the cdev's handler.

* Loop until we know for sure that the subchannel is disabled.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Sebastian Ott 2009-12-07 12:51:35 +01:00 • committed by Martin Schwidefsky

parent 24a1872d64

commit 56e6b796fe

2 changed files with 23 additions and 29 deletions

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35

drivers/s390/cio/device.c

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17

drivers/s390/cio/device_fsm.c

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