knfsd: Replace lock_kernel with a mutex in nfsd pool stats.

lock_kernel() in knfsd was replaced with a mutex. The later
commit 03cf6c9f49a8fea953d38648d016e3f46e814991 ("knfsd:
add file to export stats about nfsd pools") did not follow
that change. This patch fixes the issue.

Also move the get and put of nfsd_serv to the open and close methods
(instead of start and stop methods) to allow atomic check and increment
of reference count in the open method (where we can still return an
error).

Signed-off-by: Ryusei Yamaguchi <mandel59@gmail.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Cc: Greg Banks <gnb@fmeh.org>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 0 insertions, 11 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 27d44332f01..dcd2d1ee2e3 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1166,11 +1166,6 @@ static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos)
 
         dprintk("svc_pool_stats_start, *pidx=%u\n", pidx);
 
-        lock_kernel();
-        /* bump up the pseudo refcount while traversing */
-        svc_get(serv);
-        unlock_kernel();
-
         if (!pidx)
                 return SEQ_START_TOKEN;
         return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]);
@@ -1198,12 +1193,6 @@ static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos)
 
 static void svc_pool_stats_stop(struct seq_file *m, void *p)
 {
-        struct svc_serv *serv = m->private;
-
-        lock_kernel();
-        /* this function really, really should have been called svc_put() */
-        svc_destroy(serv);
-        unlock_kernel();
 }
 
 static int svc_pool_stats_show(struct seq_file *m, void *p)