lkml.org 
[lkml]   [2001]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
SubjectSpinlocking patch for in xprt.c
From

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);
}
}

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.073 / U:0.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site