Commit f5131257 authored Jan 11, 2012 by Stanislav Kinsbursky Committed by Trond Myklebust Jan 31, 2012

SUNRPC: remove RPC client pipefs dentries after unregister



Without this patch we have races:

rpc_fill_super				rpc_free_client
rpc_pipefs_event(MOUNT)			rpc_remove_pipedir
spin_lock(&rpc_client_lock);
rpc_setup_pipedir_sb
spin_unlock(&rpc_client_lock);
					spin_lock(&rpc_client_lock);
					(remove from list)
					spin_unlock(&rpc_client_lock);
					MEAMORY LEAKED

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

parent 80df9d20

net/sunrpc/clnt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -578,7 +578,6 @@ rpc_free_client(struct rpc_clnt *clnt)
		{
		dprintk("RPC: destroying %s client for %s\n",
		clnt->cl_protname, clnt->cl_server);
		rpc_clnt_remove_pipedir(clnt);
		if (clnt->cl_parent != clnt) {
		rpc_release_client(clnt->cl_parent);
		goto out_free;
		@@ -587,6 +586,7 @@ rpc_free_client(struct rpc_clnt *clnt)
		kfree(clnt->cl_server);
		out_free:
		rpc_unregister_client(clnt);
		rpc_clnt_remove_pipedir(clnt);
		rpc_free_iostats(clnt->cl_metrics);
		kfree(clnt->cl_principal);
		clnt->cl_metrics = NULL;