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authorSwen Schillig <swen@vnet.ibm.com>2008-11-26 18:07:40 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-01 10:18:04 -0600
commitfca55b6fb587e42c7761ee30bd1a6c313a9270c9 (patch)
tree334aaea4b8cd1c3a6d9dca3a0131005d49047358 /drivers/s390
parent0ac55aa90f2c3bd08e57e52a513b82b18ce0a5bc (diff)
[SCSI] zfcp: fix deadlock between wq triggered port scan and ERP
Waiting for the ERP to be finished in a task running in the global kernel work-queue is a bad idea, especially if the ERP needs to run another job in this work-queue before it can finish. -> deadlock. This patch removes the necessity to wait for a finished ERP from the scan task and moves the job scheduling to the end of the ERP. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/scsi/zfcp_erp.c3
-rw-r--r--drivers/s390/scsi/zfcp_fc.c1
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index c55dd2728f9..c557ba34e1a 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -720,7 +720,6 @@ static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *act,
goto failed_openfcp;
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &act->adapter->status);
- schedule_work(&act->adapter->scan_work);
return ZFCP_ERP_SUCCEEDED;
@@ -1284,6 +1283,8 @@ static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (result != ZFCP_ERP_SUCCEEDED)
zfcp_erp_rports_del(adapter);
+ else
+ schedule_work(&adapter->scan_work);
zfcp_adapter_put(adapter);
break;
}
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index ae151390cb9..8aab3091a7b 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -610,7 +610,6 @@ int zfcp_scan_ports(struct zfcp_adapter *adapter)
int ret, i;
struct zfcp_gpn_ft *gpn_ft;
- zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
return 0;