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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-10-23 17:50:07 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-10-24 10:46:08 -0400
commit4bc1e68ed6a8b59be8a79eb719be515a55c7bc68 (patch)
tree93a4b34c2759a52a1f57850c9f3719296beeee24 /net
parentb9d2bb2ee537424a7f855e1f93eed44eb9ee0854 (diff)
downloadlinux-4bc1e68ed6a8b59be8a79eb719be515a55c7bc68.tar.bz2
SUNRPC: Prevent races in xs_abort_connection()
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>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtsock.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 7e2dd0d69f1b..1f105c2d2e15 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -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)