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SUNRPC: Prevent races in xs_abort_connection()

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The call to xprt_disconnect_done() that is triggered by a successful
connection reset will trigger another automatic wakeup of all tasks
on the xprt->pending rpc_wait_queue. In particular it will cause an
early wake up of the task that called xprt_connect().

All we really want to do here is clear all the socket-specific state
flags, so we split that functionality out of xs_sock_mark_closed()
into a helper that can be called by xs_abort_connection()

Reported-by: Chris Perl <chris.perl@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
Tested-by: Chris Perl <chris.perl@gmail.com>
This commit is contained in:
Trond Myklebust 2012-10-23 17:50:07 -04:00
parent b9d2bb2ee5
commit 4bc1e68ed6
1 changed files with 8 additions and 5 deletions
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13
net/sunrpc/xprtsock.c
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@ -1453,7 +1453,7 @@ static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
xprt_clear_connecting(xprt);
}
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
{
smp_mb__before_clear_bit();
clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
@ -1461,6 +1461,11 @@ static void xs_sock_mark_closed(struct rpc_xprt *xprt)
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
clear_bit(XPRT_CLOSING, &xprt->state);
smp_mb__after_clear_bit();
}
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
{
xs_sock_reset_connection_flags(xprt);
/* Mark transport as closed and wake up all pending tasks */
xprt_disconnect_done(xprt);
}
@ -2051,10 +2056,8 @@ static void xs_abort_connection(struct sock_xprt *transport)
any.sa_family = AF_UNSPEC;
result = kernel_connect(transport->sock, &any, sizeof(any), 0);
if (!result)
xs_sock_mark_closed(&transport->xprt);
else
dprintk("RPC: AF_UNSPEC connect return code %d\n",
result);
xs_sock_reset_connection_flags(&transport->xprt);
dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
}
static void xs_tcp_reuse_connection(struct sock_xprt *transport)