diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index b8f3ac29e718..377f5d7490aa 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -234,7 +234,19 @@ void svc_xprt_received(struct svc_xprt *xprt) svc_xprt_get(xprt); smp_mb__before_atomic(); clear_bit(XPT_BUSY, &xprt->xpt_flags); - svc_xprt_enqueue(xprt); + + /* + * Skip the enqueue when no actionable flags are set. + * Each producer both sets its flag (XPT_DATA, XPT_CLOSE, + * etc.) and calls svc_xprt_enqueue(); if a set_bit races + * with this check, the producer's own enqueue observes + * !XPT_BUSY and dispatches the transport. + */ + if (READ_ONCE(xprt->xpt_flags) & + (BIT(XPT_CONN) | BIT(XPT_CLOSE) | BIT(XPT_HANDSHAKE) | + BIT(XPT_DATA) | BIT(XPT_DEFERRED))) + svc_xprt_enqueue(xprt); + svc_xprt_put(xprt); } EXPORT_SYMBOL_GPL(svc_xprt_received);