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Commit c89091c8 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

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: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 729749bb

net/sunrpc/backchannel_rqst.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

net/sunrpc/xprtsock.c

+1 −4
Original line number Diff line number Diff line
@@ -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;

}