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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-09-18 15:53:24 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-09-19 16:37:43 -0400
commit79234c3db6842a3de03817211d891e0c2878f756 (patch)
tree6ca9184d5cc5a990e7d6b756fbced46c868861dc
parent3ec0c97959abff33a42db9081c22132bcff5b4f2 (diff)
downloadlinux-79234c3db6842a3de03817211d891e0c2878f756.tar.bz2
SUNRPC: Lock the transport layer on shutdown
Avoid all races with the connect/disconnect handlers by taking the transport lock. Reported-by:"Suzuki K. Poulose" <suzuki.poulose@arm.com> Acked-by: Jeff Layton <jlayton@poochiereds.net> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--net/sunrpc/xprt.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index ab5dd621ae0c..2e98f4a243e5 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -614,6 +614,7 @@ static void xprt_autoclose(struct work_struct *work)
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
xprt->ops->close(xprt);
xprt_release_write(xprt, NULL);
+ wake_up_bit(&xprt->state, XPRT_LOCKED);
}
/**
@@ -723,6 +724,7 @@ void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie)
xprt->ops->release_xprt(xprt, NULL);
out:
spin_unlock_bh(&xprt->transport_lock);
+ wake_up_bit(&xprt->state, XPRT_LOCKED);
}
/**
@@ -1394,6 +1396,10 @@ out:
static void xprt_destroy(struct rpc_xprt *xprt)
{
dprintk("RPC: destroying transport %p\n", xprt);
+
+ /* Exclude transport connect/disconnect handlers */
+ wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE);
+
del_timer_sync(&xprt->timer);
rpc_xprt_debugfs_unregister(xprt);