[SCSI] libfc: convert rport lookup to be RCU safe
To allow LLD to do lookups on rports without grabbing a mutex,
make them RCU-safe. The caller of lport->tt.rport_lookup will
have the choice of holding disc_mutex or the rcu_read_lock().
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 6d78df7..b0310b9 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -195,6 +195,7 @@
* @rp_mutex: The mutex that protects the remote port
* @retry_work: Handle for retries
* @event_callback: Callback when READY, FAILED or LOGO states complete
+ * @rcu: Structure used for freeing in an RCU-safe manner
*/
struct fc_rport_priv {
struct fc_lport *local_port;
@@ -217,6 +218,7 @@
struct list_head peers;
struct work_struct event_work;
u32 supported_classes;
+ struct rcu_head rcu;
};
/**