diff options
| author | Christof Schmitt <christof.schmitt@de.ibm.com> | 2009-08-18 15:43:27 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-09-05 08:49:41 -0500 |
| commit | 143bb6bfe36d20618d8bf667915fe14d14b8ae2f (patch) | |
| tree | c0c1dad94d0ec49f25b3652581931f2b499b5f07 /drivers/s390/scsi/zfcp_aux.c | |
| parent | 98fc4d5c8cd9bd1a412cca922feecb54c1c22d8e (diff) | |
[SCSI] zfcp: Defer resource allocation to first ccw_set_online call
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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_aux.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_aux.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c index e8f39f02bc3..d1e75d36ed1 100644 --- a/drivers/s390/scsi/zfcp_aux.c +++ b/drivers/s390/scsi/zfcp_aux.c @@ -541,6 +541,9 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device) rwlock_init(&adapter->erp_lock); rwlock_init(&adapter->abort_lock); + if (zfcp_erp_thread_setup(adapter)) + goto erp_thread_failed; + INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later); @@ -561,6 +564,8 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device) return 0; sysfs_failed: + zfcp_erp_thread_kill(adapter); +erp_thread_failed: zfcp_fc_gs_destroy(adapter); generic_services_failed: zfcp_destroy_adapter_work_queue(adapter); @@ -602,6 +607,7 @@ void zfcp_adapter_dequeue(struct zfcp_adapter *adapter) return; zfcp_fc_gs_destroy(adapter); + zfcp_erp_thread_kill(adapter); zfcp_destroy_adapter_work_queue(adapter); zfcp_dbf_adapter_unregister(adapter->dbf); zfcp_free_low_mem_buffers(adapter); |