From cb0972746336884f0a59d2dc4c69f8ccbd2bbb36 Mon Sep 17 00:00:00 2001
From: adilger <adilger>
Date: Wed, 3 Apr 2002 07:26:49 +0000
Subject: [PATCH] Move MOD_INC_USE_COUNT up in ost_setup() to avoid module
 unload races.

---
 lustre/ost/ost_handler.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/lustre/ost/ost_handler.c b/lustre/ost/ost_handler.c
index 67a1653..29f57a4 100644
--- a/lustre/ost/ost_handler.c
+++ b/lustre/ost/ost_handler.c
@@ -434,7 +434,7 @@ static int ost_brw_write_cb(struct ptlrpc_bulk_desc *bulk, void *data)
         RETURN(rc);
 }
 
-int ost_brw_write(struct ost_obd *obddev, struct ptlrpc_request *req)
+static int ost_brw_write(struct ost_obd *obddev, struct ptlrpc_request *req)
 {
         struct obd_conn conn;
         int rc;
@@ -531,7 +531,7 @@ int ost_brw_write(struct ost_obd *obddev, struct ptlrpc_request *req)
         return 0;
 }
 
-int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
+static int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
 {
         struct ost_req *r = req->rq_req.ost;
         int cmd = r->cmd;
@@ -659,20 +659,21 @@ static int ost_setup(struct obd_device *obddev, obd_count len,
         if (data->ioc_dev  < 0 || data->ioc_dev > MAX_OBD_DEVICES)
                 RETURN(-ENODEV);
 
+        MOD_INC_USE_COUNT;
         tgt = &obd_dev[data->ioc_dev];
         ost->ost_tgt = tgt;
         if ( ! (tgt->obd_flags & OBD_ATTACHED) ||
              ! (tgt->obd_flags & OBD_SET_UP) ){
                 CERROR("device not attached or not set up (%d)\n",
                        data->ioc_dev);
-                RETURN(-EINVAL);
+                GOTO(error_dec, err = -EINVAL);
         }
 
         ost->ost_conn.oc_dev = tgt;
         err = obd_connect(&ost->ost_conn);
         if (err) {
                 CERROR("fail to connect to device %d\n", data->ioc_dev);
-                RETURN(-EINVAL);
+                GOTO(error_dec, err = -EINVAL);
         }
 
         ost->ost_service = ptlrpc_init_svc(128 * 1024,
@@ -680,18 +681,21 @@ static int ost_setup(struct obd_device *obddev, obd_count len,
                                            "self", ost_handle);
         if (!ost->ost_service) {
                 CERROR("failed to start service\n");
-                obd_disconnect(&ost->ost_conn);
-                RETURN(-EINVAL);
+                GOTO(error_disc, err = -EINVAL);
         }
 
         err = ptlrpc_start_thread(obddev, ost->ost_service, "lustre_ost");
         if (err) {
-                obd_disconnect(&ost->ost_conn);
-                RETURN(-EINVAL);
+                GOTO(error_disc, err = -EINVAL);
         }
 
-        MOD_INC_USE_COUNT;
         RETURN(0);
+
+error_disc:
+        obd_disconnect(&ost->ost_conn);
+error_dec:
+        MOD_DEC_USE_COUNT;
+        RETURN(err);
 }
 
 static int ost_cleanup(struct obd_device * obddev)
-- 
1.8.3.1