The following patch (taken from the zero copy networking) upgrades the
spinlocking of the xprt_(up|down)_transmit() 'semaphores' in order to
work safely with the networking bottom halves. Several of the latter
(cf. xprt.c:tcp_write_space() & friends) do want to test the value of
'xprt->snd_task'.
Cheers,
Trond
diff -u --recursive --new-file linux-2.4.1-fh_align/net/sunrpc/xprt.c
linux-2.4.1-xprt/net/sunrpc/xprt.c
--- linux-2.4.1-fh_align/net/sunrpc/xprt.c Wed Nov 29 07:34:01 2000
+++ linux-2.4.1-xprt/net/sunrpc/xprt.c Fri Jan 12 11:58:42 2001
@@ -1116,7 +1116,7 @@
struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
struct rpc_rqst *req = task->tk_rqstp;
- spin_lock(&xprt_lock);
+ spin_lock_bh(&xprt_sock_lock);
if (xprt->snd_task && xprt->snd_task != task) {
dprintk("RPC: %4d TCP write queue full (task %d)\n",
task->tk_pid, xprt->snd_task->tk_pid);
@@ -1130,7 +1130,7 @@
#endif
req->rq_bytes_sent = 0;
}
- spin_unlock(&xprt_lock);
+ spin_unlock_bh(&xprt_sock_lock);
return xprt->snd_task == task;
}
@@ -1143,10 +1143,10 @@
struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
if (xprt->snd_task && xprt->snd_task == task) {
- spin_lock(&xprt_lock);
+ spin_lock_bh(&xprt_sock_lock);
xprt->snd_task = NULL;
rpc_wake_up_next(&xprt->sending);
- spin_unlock(&xprt_lock);
+ spin_unlock_bh(&xprt_sock_lock);
}
}
-
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