[SCSI] zfcp: Defer resource allocation to first ccw_set_online call

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So far, zfcp allocated all resources required for FCP
adapters/subchannels when the device was discovered in the ccw_probe
callback. If there are lots of unused FCP subchannels attached to a
system, this is a waste of resources. To alleviate this, defer the
resource allocation to the first call to ccw_set_online. To avoid
disruptions during possible following calls to ccw_set_offline and
then ccw_set_online, keep the adapter resources until the device is
finally being removed via ccw_remove. While doing this, also manage
the zfcp erp thread together with all other adapter resources in
zfcp_adapter_enqueue/dequeue.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

...

This commit is contained in:

Christof Schmitt 2009-08-18 15:43:27 +02:00 • committed by James Bottomley

parent 98fc4d5c8c

commit 143bb6bfe3

3 changed files with 54 additions and 31 deletions

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6

drivers/s390/scsi/zfcp_aux.c

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74

drivers/s390/scsi/zfcp_ccw.c

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5

drivers/s390/scsi/zfcp_erp.c

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