SUNRPC: spin svc_rqst initialization to its own function

Move the initialzation in __svc_create_thread that happens prior to
thread creation to a new function. Export the function to allow
services to have better control over the svc_rqst structs.

Also rearrange the rqstp initialization to prevent NULL pointer
dereferences in svc_exit_thread in case allocations fail.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

2 files changed, 44 insertions, 17 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 742ab461d842..64c771056187 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -384,6 +384,8 @@ struct svc_procedure {
  */
 struct svc_serv *  svc_create(struct svc_program *, unsigned int,
                               void (*shutdown)(struct svc_serv*));
+struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
+                                        struct svc_pool *pool);
 int                svc_create_thread(svc_thread_fn, struct svc_serv *);
 void               svc_exit_thread(struct svc_rqst *);
 struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index a5eb2d6b14ae..b76963d52657 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -531,31 +531,17 @@ svc_release_buffer(struct svc_rqst *rqstp)
                         put_page(rqstp->rq_pages[i]);
 }
 
-/*
- * Create a thread in the given pool.  Caller must hold BKL.
- * On a NUMA or SMP machine, with a multi-pool serv, the thread
- * will be restricted to run on the cpus belonging to the pool.
- */
-static int
-__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
-                    struct svc_pool *pool)
+struct svc_rqst *
+svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
 {
         struct svc_rqst *rqstp;
-        int             error = -ENOMEM;
-        int             have_oldmask = 0;
-        cpumask_t       oldmask;
 
         rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
         if (!rqstp)
-                goto out;
+                goto out_enomem;
 
         init_waitqueue_head(&rqstp->rq_wait);
 
-        if (!(rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
-         || !(rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
-         || !svc_init_buffer(rqstp, serv->sv_max_mesg))
-                goto out_thread;
-
         serv->sv_nrthreads++;
         spin_lock_bh(&pool->sp_lock);
         pool->sp_nrthreads++;
@@ -564,6 +550,45 @@ __svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
         rqstp->rq_server = serv;
         rqstp->rq_pool = pool;
 
+        rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
+        if (!rqstp->rq_argp)
+                goto out_thread;
+
+        rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
+        if (!rqstp->rq_resp)
+                goto out_thread;
+
+        if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
+                goto out_thread;
+
+        return rqstp;
+out_thread:
+        svc_exit_thread(rqstp);
+out_enomem:
+        return ERR_PTR(-ENOMEM);
+}
+EXPORT_SYMBOL(svc_prepare_thread);
+
+/*
+ * Create a thread in the given pool.  Caller must hold BKL.
+ * On a NUMA or SMP machine, with a multi-pool serv, the thread
+ * will be restricted to run on the cpus belonging to the pool.
+ */
+static int
+__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
+                    struct svc_pool *pool)
+{
+        struct svc_rqst *rqstp;
+        int             error = -ENOMEM;
+        int             have_oldmask = 0;
+        cpumask_t       oldmask;
+
+        rqstp = svc_prepare_thread(serv, pool);
+        if (IS_ERR(rqstp)) {
+                error = PTR_ERR(rqstp);
+                goto out;
+        }
+
         if (serv->sv_nrpools > 1)
                 have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask);