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SUNRPC: skip dead but not buried clients on PipeFS events
author
Stanislav Kinsbursky
<skinsbursky@parallels.com>
Fri, 20 Apr 2012 14:11:02 +0000
(18:11 +0400)
committer
Trond Myklebust
<Trond.Myklebust@netapp.com>
Fri, 27 Apr 2012 18:09:59 +0000
(14:09 -0400)
These clients can't be safely dereferenced if their counter in 0.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
net/sunrpc/clnt.c
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diff --git
a/net/sunrpc/clnt.c
b/net/sunrpc/clnt.c
index
6797246
..
d10ebc4
100644
(file)
--- a/
net/sunrpc/clnt.c
+++ b/
net/sunrpc/clnt.c
@@
-218,7
+218,8
@@
static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
continue;
- atomic_inc(&clnt->cl_count);
+ if (atomic_inc_not_zero(&clnt->cl_count) == 0)
+ continue;
spin_unlock(&sn->rpc_client_lock);
return clnt;
}