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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-11-06 10:18:36 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-30 02:05:24 -0500 |
| commit | 66af1e558538137080615e7ad6d1f2f80862de01 (patch) | |
| tree | f5f9680b86846d4df8312cd9bd729d6e10c7b5e8 /net/sunrpc | |
| parent | ef818a28fac9bd214e676986d8301db0582b92a9 (diff) | |
| download | linux-stable-66af1e558538137080615e7ad6d1f2f80862de01.tar.gz linux-stable-66af1e558538137080615e7ad6d1f2f80862de01.tar.bz2 linux-stable-66af1e558538137080615e7ad6d1f2f80862de01.zip | |
SUNRPC: Fix a race in xs_tcp_state_change()
When scheduling the autoclose RPC call, we want to ensure that we don't
race against the test_bit() call in xprt_clear_locked().
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprt.c | 20 | ||||
| -rw-r--r-- | net/sunrpc/xprtsock.c | 5 |
2 files changed, 21 insertions, 4 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index fb92f51405c5..a3af02168af1 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -570,6 +570,7 @@ static void xprt_autoclose(struct work_struct *work) xprt_disconnect(xprt); xprt->ops->close(xprt); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); xprt_release_write(xprt, NULL); } @@ -588,6 +589,25 @@ void xprt_disconnect(struct rpc_xprt *xprt) } EXPORT_SYMBOL_GPL(xprt_disconnect); +/** + * xprt_force_disconnect - force a transport to disconnect + * @xprt: transport to disconnect + * + */ +void xprt_force_disconnect(struct rpc_xprt *xprt) +{ + /* Don't race with the test_bit() in xprt_clear_locked() */ + spin_lock_bh(&xprt->transport_lock); + set_bit(XPRT_CLOSE_WAIT, &xprt->state); + /* Try to schedule an autoclose RPC call */ + if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) + queue_work(rpciod_workqueue, &xprt->task_cleanup); + else if (xprt->snd_task != NULL) + rpc_wake_up_task(xprt->snd_task); + spin_unlock_bh(&xprt->transport_lock); +} +EXPORT_SYMBOL_GPL(xprt_force_disconnect); + static void xprt_init_autodisconnect(unsigned long data) { diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 6fa52f44de0f..abb40c140738 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -1122,10 +1122,7 @@ static void xs_tcp_state_change(struct sock *sk) case TCP_SYN_RECV: break; case TCP_CLOSE_WAIT: - /* Try to schedule an autoclose RPC calls */ - set_bit(XPRT_CLOSE_WAIT, &xprt->state); - if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) - queue_work(rpciod_workqueue, &xprt->task_cleanup); + xprt_force_disconnect(xprt); default: xprt_disconnect(xprt); } |