[SCSI] zfcp: Replace config semaphore with mutex
The config semaphore is only used as a mutex, so replace it with a
simple mutex.
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>
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index d1e75d3..8e989159 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -84,7 +84,7 @@
struct zfcp_port *port;
struct zfcp_unit *unit;
- down(&zfcp_data.config_sema);
+ mutex_lock(&zfcp_data.config_mutex);
read_lock_irq(&zfcp_data.config_lock);
adapter = zfcp_get_adapter_by_busid(busid);
if (adapter)
@@ -99,20 +99,20 @@
unit = zfcp_unit_enqueue(port, lun);
if (IS_ERR(unit))
goto out_unit;
- up(&zfcp_data.config_sema);
+ mutex_unlock(&zfcp_data.config_mutex);
ccw_device_set_online(adapter->ccw_device);
zfcp_erp_wait(adapter);
flush_work(&unit->scsi_work);
- down(&zfcp_data.config_sema);
+ mutex_lock(&zfcp_data.config_mutex);
zfcp_unit_put(unit);
out_unit:
zfcp_port_put(port);
out_port:
zfcp_adapter_put(adapter);
out_adapter:
- up(&zfcp_data.config_sema);
+ mutex_unlock(&zfcp_data.config_mutex);
return;
}
@@ -176,7 +176,7 @@
if (!zfcp_data.gid_pn_cache)
goto out_gid_cache;
- sema_init(&zfcp_data.config_sema, 1);
+ mutex_init(&zfcp_data.config_mutex);
rwlock_init(&zfcp_data.config_lock);
zfcp_data.scsi_transport_template =
@@ -266,7 +266,7 @@
* @port: pointer to port where unit is added
* @fcp_lun: FCP LUN of unit to be enqueued
* Returns: pointer to enqueued unit on success, ERR_PTR on error
- * Locks: config_sema must be held to serialize changes to the unit list
+ * Locks: config_mutex must be held to serialize changes to the unit list
*
* Sets up some unit internal structures and creates sysfs entry.
*/
@@ -356,7 +356,7 @@
static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
- /* must only be called with zfcp_data.config_sema taken */
+ /* must only be called with zfcp_data.config_mutex taken */
adapter->pool.erp_req =
mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
if (!adapter->pool.erp_req)
@@ -404,7 +404,7 @@
static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
- /* zfcp_data.config_sema must be held */
+ /* zfcp_data.config_mutex must be held */
if (adapter->pool.erp_req)
mempool_destroy(adapter->pool.erp_req);
if (adapter->pool.scsi_req)
@@ -491,7 +491,7 @@
* Enqueues an adapter at the end of the adapter list in the driver data.
* All adapter internal structures are set up.
* Proc-fs entries are also created.
- * locks: config_sema must be held to serialise changes to the adapter list
+ * locks: config_mutex must be held to serialize changes to the adapter list
*/
int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
{
@@ -499,7 +499,7 @@
/*
* Note: It is safe to release the list_lock, as any list changes
- * are protected by the config_sema, which must be held to get here
+ * are protected by the config_mutex, which must be held to get here
*/
adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
@@ -630,7 +630,7 @@
* @status: initial status for the port
* @d_id: destination id of the remote port to be enqueued
* Returns: pointer to enqueued port on success, ERR_PTR on error
- * Locks: config_sema must be held to serialize changes to the port list
+ * Locks: config_mutex must be held to serialize changes to the port list
*
* All port internal structures are set up and the sysfs entry is generated.
* d_id is used to enqueue ports with a well known address like the Directory