aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/scsi/zfcp_aux.c
diff options
context:
space:
mode:
authorChristof Schmitt <christof.schmitt@de.ibm.com>2009-08-18 15:43:27 +0200
committerJames Bottomley <James.Bottomley@suse.de>2009-09-05 08:49:41 -0500
commit143bb6bfe36d20618d8bf667915fe14d14b8ae2f (patch)
treec0c1dad94d0ec49f25b3652581931f2b499b5f07 /drivers/s390/scsi/zfcp_aux.c
parent98fc4d5c8cd9bd1a412cca922feecb54c1c22d8e (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.c6
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);