[SCSI] zfcp: Replace global config_lock with local list locks
The global config_lock was used to protect the configuration organized
in independent lists. It is not necessary to have a lock on driver
level for this purpose. This patch replaces the global config_lock
with a set of local list locks.
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@suse.de>
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index df23bce..c7efdc5 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -145,10 +145,11 @@
struct fcp_rscn_element *elem)
{
unsigned long flags;
+ struct zfcp_adapter *adapter = fsf_req->adapter;
struct zfcp_port *port;
- read_lock_irqsave(&zfcp_data.config_lock, flags);
- list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
+ read_lock_irqsave(&adapter->port_list_lock, flags);
+ list_for_each_entry(port, &adapter->port_list, list) {
if ((port->d_id & range) == (elem->nport_did & range))
zfcp_fc_test_link(port);
if (!port->d_id)
@@ -156,8 +157,7 @@
ZFCP_STATUS_COMMON_ERP_FAILED,
"fcrscn1", NULL);
}
-
- read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+ read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
@@ -187,18 +187,17 @@
static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
{
+ unsigned long flags;
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_port *port;
- unsigned long flags;
- read_lock_irqsave(&zfcp_data.config_lock, flags);
- list_for_each_entry(port, &adapter->port_list_head, list)
- if (port->wwpn == wwpn)
+ read_lock_irqsave(&adapter->port_list_lock, flags);
+ list_for_each_entry(port, &adapter->port_list, list)
+ if (port->wwpn == wwpn) {
+ zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
break;
- read_unlock_irqrestore(&zfcp_data.config_lock, flags);
-
- if (port && (port->wwpn == wwpn))
- zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
+ }
+ read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
@@ -579,20 +578,17 @@
static void zfcp_fc_validate_port(struct zfcp_port *port)
{
- struct zfcp_adapter *adapter = port->adapter;
-
if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
return;
atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
if ((port->supported_classes != 0) ||
- !list_empty(&port->unit_list_head)) {
+ !list_empty(&port->unit_list)) {
zfcp_port_put(port);
return;
}
zfcp_erp_port_shutdown(port, 0, "fcpval1", NULL);
- zfcp_erp_wait(adapter);
zfcp_port_put(port);
zfcp_port_dequeue(port);
}
@@ -605,6 +601,7 @@
struct gpn_ft_resp_acc *acc = sg_virt(sg);
struct zfcp_adapter *adapter = ct->wka_port->adapter;
struct zfcp_port *port, *tmp;
+ unsigned long flags;
u32 d_id;
int ret = 0, x, last = 0;
@@ -643,21 +640,20 @@
/* skip the adapter's port and known remote ports */
if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
continue;
- port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
- if (port)
- continue;
port = zfcp_port_enqueue(adapter, acc->wwpn,
ZFCP_STATUS_COMMON_NOESC, d_id);
- if (IS_ERR(port))
- ret = PTR_ERR(port);
- else
+ if (!IS_ERR(port))
zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
+ else if (PTR_ERR(port) != -EEXIST)
+ ret = PTR_ERR(port);
}
zfcp_erp_wait(adapter);
- list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
+ write_lock_irqsave(&adapter->port_list_lock, flags);
+ list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
zfcp_fc_validate_port(port);
+ write_unlock_irqrestore(&adapter->port_list_lock, flags);
mutex_unlock(&zfcp_data.config_mutex);
return ret;
}
@@ -760,15 +756,14 @@
els_fc_job->els.adapter = adapter;
if (rport) {
- read_lock_irq(&zfcp_data.config_lock);
port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
- if (port)
- els_fc_job->els.d_id = port->d_id;
- read_unlock_irq(&zfcp_data.config_lock);
if (!port) {
kfree(els_fc_job);
return -EINVAL;
}
+
+ els_fc_job->els.d_id = port->d_id;
+ zfcp_port_put(port);
} else {
port_did = job->request->rqst_data.h_els.port_id;
els_fc_job->els.d_id = (port_did[0] << 16) +