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[SCSI] zfcp: fix race conditions when accessing erp_action lists

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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>
This commit is contained in:
Andreas Herrmann 2005-09-13 21:47:11 +02:00 committed by James Bottomley
parent e0fc15bef0
commit 3734d24b2e
1 changed files with 17 additions and 7 deletions
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24
drivers/s390/scsi/zfcp_erp.c
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@ -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;