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authorChuck Lever <chuck.lever@oracle.com>2019-09-13 16:01:07 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-09-20 15:15:24 -0400
commit8593e010786181df887b001824ff8f3e52e2098f (patch)
treec54e3b4ea70d7ab295622d70673d3b9862409a99 /net
parent9ba828861c56a21d211d5d10f5643774b1ea330d (diff)
SUNRPC: Fix congestion window race with disconnect
If the congestion window closes just as the transport disconnects, a reconnect is never driven because: 1. The XPRT_CONG_WAIT flag prevents tasks from taking the write lock 2. There's no wake-up of the first task on the xprt->sending queue To address this, clear the congestion wait flag as part of completing a disconnect. Fixes: 75891f502f5f ("SUNRPC: Support for congestion control ... ") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprt.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 02d5b2125c07..83ec4edd2f91 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -456,6 +456,12 @@ void xprt_release_rqst_cong(struct rpc_task *task)
}
EXPORT_SYMBOL_GPL(xprt_release_rqst_cong);
+static void xprt_clear_congestion_window_wait_locked(struct rpc_xprt *xprt)
+{
+ if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state))
+ __xprt_lock_write_next_cong(xprt);
+}
+
/*
* Clear the congestion window wait flag and wake up the next
* entry on xprt->sending
@@ -671,6 +677,7 @@ void xprt_disconnect_done(struct rpc_xprt *xprt)
spin_lock(&xprt->transport_lock);
xprt_clear_connected(xprt);
xprt_clear_write_space_locked(xprt);
+ xprt_clear_congestion_window_wait_locked(xprt);
xprt_wake_pending_tasks(xprt, -ENOTCONN);
spin_unlock(&xprt->transport_lock);
}

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