[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>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index c7985da8809..d0fa9a0ddc8 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -63,12 +63,12 @@ static void fc_disc_restart(struct fc_disc *);
 void fc_disc_stop_rports(struct fc_disc *disc)
 {
         struct fc_lport *lport;
-        struct fc_rport_priv *rdata, *next;
+        struct fc_rport_priv *rdata;
 
         lport = disc->lport;
 
         mutex_lock(&disc->disc_mutex);
-        list_for_each_entry_safe(rdata, next, &disc->rports, peers)
+        list_for_each_entry_rcu(rdata, &disc->rports, peers)
                 lport->tt.rport_logoff(rdata);
         mutex_unlock(&disc->disc_mutex);
 }
@@ -292,7 +292,7 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
          * Skip ports which were never discovered.  These are the dNS port
          * and ports which were created by PLOGI.
          */
-        list_for_each_entry(rdata, &disc->rports, peers) {
+        list_for_each_entry_rcu(rdata, &disc->rports, peers) {
                 if (!rdata->disc_id)
                         continue;
                 if (rdata->disc_id == disc->disc_id)