From 4bcb38c2545a3c50329ed360a2ef39518deeb918 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Wed, 16 Aug 2017 12:09:44 -0400
Subject: [PATCH] SUNRPC: Don't hold the transport lock when receiving
backchannel data
The backchannel request has no associated task, so it is going nowhere
until we call xprt_complete_bc_request().
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---
net/sunrpc/backchannel_rqst.c | 4 ++--
net/sunrpc/xprtsock.c | 5 +----
2 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
index ac701c28f44f3..c2c68a15b59de 100644
--- a/net/sunrpc/backchannel_rqst.c
+++ b/net/sunrpc/backchannel_rqst.c
@@ -171,10 +171,10 @@ int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs)
/*
* Add the temporary list to the backchannel preallocation list
*/
- spin_lock_bh(&xprt->bc_pa_lock);
+ spin_lock(&xprt->bc_pa_lock);
list_splice(&tmp_list, &xprt->bc_pa_list);
xprt_inc_alloc_count(xprt, min_reqs);
- spin_unlock_bh(&xprt->bc_pa_lock);
+ spin_unlock(&xprt->bc_pa_lock);
dprintk("RPC: setup backchannel transport done\n");
return 0;
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 04dbc7027712b..a2312f14beb43 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1389,11 +1389,9 @@ static int xs_tcp_read_callback(struct rpc_xprt *xprt,
container_of(xprt, struct sock_xprt, xprt);
struct rpc_rqst *req;
- /* Look up and lock the request corresponding to the given XID */
- spin_lock_bh(&xprt->transport_lock);
+ /* Look up the request corresponding to the given XID */
req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
if (req == NULL) {
- spin_unlock_bh(&xprt->transport_lock);
printk(KERN_WARNING "Callback slot table overflowed\n");
xprt_force_disconnect(xprt);
return -1;
@@ -1404,7 +1402,6 @@ static int xs_tcp_read_callback(struct rpc_xprt *xprt,
if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
xprt_complete_bc_request(req, transport->tcp_copied);
- spin_unlock_bh(&xprt->transport_lock);
return 0;
}
--
2.39.5