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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>
zero-colors
Trond Myklebust 2017-08-16 12:09:44 -04:00
parent 729749bb8d
commit c89091c88d
2 changed files with 3 additions and 6 deletions
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4
net/sunrpc/backchannel_rqst.c
View File

@ -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;

5
net/sunrpc/xprtsock.c
View File

@ -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;
}