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| author | Andreas Herrmann <aherrman@de.ibm.com> | 2005-09-13 21:47:11 +0200 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-09-19 13:00:50 -0500 |
| commit | 3734d24b2e8d85796de70c13705cfb7cbb1d77df (patch) | |
| tree | c89ddff8f636bea1a33bc88873e40dc7d562be46 /drivers/s390/scsi | |
| parent | e0fc15bef0e8c6b5abad6e10cfe3d42e278ae8e8 (diff) | |
| download | kernel-crypto-3734d24b2e8d85796de70c13705cfb7cbb1d77df.tar.gz kernel-crypto-3734d24b2e8d85796de70c13705cfb7cbb1d77df.tar.xz kernel-crypto-3734d24b2e8d85796de70c13705cfb7cbb1d77df.zip | |
[SCSI] zfcp: fix race conditions when accessing erp_action lists
o always use locking when changing erp_action lists,
o avoid escalation to ERP_ACTION_REOPEN_PORT_FORCED if erp_action is
still in use for ERP_ACTION_REOPEN_PORT
Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/s390/scsi')
| -rw-r--r-- | drivers/s390/scsi/zfcp_erp.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c index cb4f612550b..376cb0f6cb7 100644 --- a/drivers/s390/scsi/zfcp_erp.c +++ b/drivers/s390/scsi/zfcp_erp.c @@ -886,7 +886,7 @@ static int zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action) { int retval = 0; - struct zfcp_fsf_req *fsf_req; + struct zfcp_fsf_req *fsf_req = NULL; struct zfcp_adapter *adapter = erp_action->adapter; if (erp_action->fsf_req) { @@ -896,7 +896,7 @@ zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action) list_for_each_entry(fsf_req, &adapter->fsf_req_list_head, list) if (fsf_req == erp_action->fsf_req) break; - if (fsf_req == erp_action->fsf_req) { + if (fsf_req && (fsf_req->erp_action == erp_action)) { /* fsf_req still exists */ debug_text_event(adapter->erp_dbf, 3, "a_ca_req"); debug_event(adapter->erp_dbf, 3, &fsf_req, @@ -2291,7 +2291,9 @@ zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *erp_action) atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT, &adapter->status); ZFCP_LOG_DEBUG("Doing exchange config data\n"); + write_lock(&adapter->erp_lock); zfcp_erp_action_to_running(erp_action); + write_unlock(&adapter->erp_lock); zfcp_erp_timeout_init(erp_action); if (zfcp_fsf_exchange_config_data(erp_action)) { retval = ZFCP_ERP_FAILED; @@ -3194,11 +3196,19 @@ zfcp_erp_action_enqueue(int action, /* fall through !!! */ case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: - if (atomic_test_mask - (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status) - && port->erp_action.action == - ZFCP_ERP_ACTION_REOPEN_PORT_FORCED) { - debug_text_event(adapter->erp_dbf, 4, "pf_actenq_drp"); + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, + &port->status)) { + if (port->erp_action.action != + ZFCP_ERP_ACTION_REOPEN_PORT_FORCED) { + ZFCP_LOG_INFO("dropped erp action %i (port " + "0x%016Lx, action in use: %i)\n", + action, port->wwpn, + port->erp_action.action); + debug_text_event(adapter->erp_dbf, 4, + "pf_actenq_drp"); + } else + debug_text_event(adapter->erp_dbf, 4, + "pf_actenq_drpcp"); debug_event(adapter->erp_dbf, 4, &port->wwpn, sizeof (wwn_t)); goto out; |