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| 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_erp.c | |
| parent | 98fc4d5c8cd9bd1a412cca922feecb54c1c22d8e (diff) | |
| download | linux-stable-143bb6bfe36d20618d8bf667915fe14d14b8ae2f.tar.gz linux-stable-143bb6bfe36d20618d8bf667915fe14d14b8ae2f.tar.bz2 linux-stable-143bb6bfe36d20618d8bf667915fe14d14b8ae2f.zip | |
[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_erp.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_erp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c index 577e15708598..73d366ba31e5 100644 --- a/drivers/s390/scsi/zfcp_erp.c +++ b/drivers/s390/scsi/zfcp_erp.c @@ -150,6 +150,9 @@ static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter, a_status = atomic_read(&adapter->status); if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE) return 0; + if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) && + !(a_status & ZFCP_STATUS_COMMON_OPEN)) + return 0; /* shutdown requested for closed adapter */ } return need; @@ -1349,6 +1352,8 @@ void zfcp_erp_thread_kill(struct zfcp_adapter *adapter) { kthread_stop(adapter->erp_thread); adapter->erp_thread = NULL; + WARN_ON(!list_empty(&adapter->erp_ready_head)); + WARN_ON(!list_empty(&adapter->erp_running_head)); } /** |