[SCSI] zfcp: Replace local reference counting with common kref

Replace the local reference counting by already available mechanisms
offered by kref. Where possible existing device structures were used,
including the same functionality.

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>

1 files changed, 1 insertions, 52 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index e45a08d6c98..55dc402c3ae 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -446,9 +446,7 @@ struct zfcp_qdio {
 };
 
 struct zfcp_adapter {
-        atomic_t                refcount;          /* reference count */
-        wait_queue_head_t       remove_wq;         /* can be used to wait for
-                                                      refcount drop to zero */
+        struct kref             ref;
         u64                     peer_wwnn;         /* P2P peer WWNN */
         u64                     peer_wwpn;         /* P2P peer WWPN */
         u32                     peer_d_id;         /* P2P peer D_ID */
@@ -501,9 +499,6 @@ struct zfcp_port {
         struct device          sysfs_device;   /* sysfs device */
         struct fc_rport        *rport;         /* rport of fc transport class */
         struct list_head       list;           /* list of remote ports */
-        atomic_t               refcount;       /* reference count */
-        wait_queue_head_t      remove_wq;      /* can be used to wait for
-                                                  refcount drop to zero */
         struct zfcp_adapter    *adapter;       /* adapter used to access port */
         struct list_head        unit_list;      /* head of logical unit list */
         rwlock_t                unit_list_lock; /* unit list lock */
@@ -525,9 +520,6 @@ struct zfcp_port {
 struct zfcp_unit {
         struct device          sysfs_device;   /* sysfs device */
         struct list_head       list;           /* list of logical units */
-        atomic_t               refcount;       /* reference count */
-        wait_queue_head_t      remove_wq;      /* can be used to wait for
-                                                  refcount drop to zero */
         struct zfcp_port       *port;          /* remote port of unit */
         atomic_t               status;         /* status of this logical unit */
         u64                    fcp_lun;        /* own FCP_LUN */
@@ -656,47 +648,4 @@ zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
         return NULL;
 }
 
-/*
- *  functions needed for reference/usage counting
- */
-
-static inline void
-zfcp_unit_get(struct zfcp_unit *unit)
-{
-        atomic_inc(&unit->refcount);
-}
-
-static inline void
-zfcp_unit_put(struct zfcp_unit *unit)
-{
-        if (atomic_dec_return(&unit->refcount) == 0)
-                wake_up(&unit->remove_wq);
-}
-
-static inline void
-zfcp_port_get(struct zfcp_port *port)
-{
-        atomic_inc(&port->refcount);
-}
-
-static inline void
-zfcp_port_put(struct zfcp_port *port)
-{
-        if (atomic_dec_return(&port->refcount) == 0)
-                wake_up(&port->remove_wq);
-}
-
-static inline void
-zfcp_adapter_get(struct zfcp_adapter *adapter)
-{
-        atomic_inc(&adapter->refcount);
-}
-
-static inline void
-zfcp_adapter_put(struct zfcp_adapter *adapter)
-{
-        if (atomic_dec_return(&adapter->refcount) == 0)
-                wake_up(&adapter->remove_wq);
-}
-
 #endif /* ZFCP_DEF_H */