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SUNRPC: Eliminate task->tk_xprt accesses that bypass rcu_dereference()

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tk_xprt is just a shortcut for tk_client->cl_xprt, however cl_xprt is
defined as an __rcu variable. Replace dereferences of tk_xprt with
non-rcu dereferences where it is safe to do so.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2013-01-08 09:10:21 -05:00
parent 88b62b915b
commit a4f0835c60
7 changed files with 18 additions and 16 deletions
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12
net/sunrpc/clnt.c
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@@ -1400,7 +1400,7 @@ call_allocate(struct rpc_task *task)
{
unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_xprt *xprt = req->rq_xprt;
struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
dprint_status(task);
@@ -1685,7 +1685,7 @@ call_transmit(struct rpc_task *task)
if (rpc_reply_expected(task))
return;
task->tk_action = rpc_exit_task;
rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
}
/*
@@ -1784,7 +1784,7 @@ call_bc_transmit(struct rpc_task *task)
*/
printk(KERN_NOTICE "RPC: Could not send backchannel reply "
"error: %d\n", task->tk_status);
xprt_conditional_disconnect(task->tk_xprt,
xprt_conditional_disconnect(req->rq_xprt,
req->rq_connect_cookie);
break;
default:
@@ -1836,7 +1836,7 @@ call_status(struct rpc_task *task)
case -ETIMEDOUT:
task->tk_action = call_timeout;
if (task->tk_client->cl_discrtry)
xprt_conditional_disconnect(task->tk_xprt,
xprt_conditional_disconnect(req->rq_xprt,
req->rq_connect_cookie);
break;
case -ECONNRESET:
@@ -1991,7 +1991,7 @@ out_retry:
if (task->tk_rqstp == req) {
req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
if (task->tk_client->cl_discrtry)
xprt_conditional_disconnect(task->tk_xprt,
xprt_conditional_disconnect(req->rq_xprt,
req->rq_connect_cookie);
}
}
@@ -2005,7 +2005,7 @@ rpc_encode_header(struct rpc_task *task)
/* FIXME: check buffer size? */
p = xprt_skip_transport_header(task->tk_xprt, p);
p = xprt_skip_transport_header(req->rq_xprt, p);
*p++ = req->rq_xid; /* XID */
*p++ = htonl(RPC_CALL); /* CALL */
*p++ = htonl(RPC_VERSION); /* RPC version */