SUNRPC: Ensure we always bump the backlog queue in xprt_free_slot
Whenever we free a slot, we know that the resulting xprt->num_reqs will be less than xprt->max_reqs, so we know that we can release at least one backlogged rpc_task. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org [>=3.1]
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@ -995,13 +995,11 @@ out_init_req:
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static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
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{
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if (xprt_dynamic_free_slot(xprt, req))
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return;
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memset(req, 0, sizeof(*req)); /* mark unused */
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spin_lock(&xprt->reserve_lock);
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list_add(&req->rq_list, &xprt->free);
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if (!xprt_dynamic_free_slot(xprt, req)) {
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memset(req, 0, sizeof(*req)); /* mark unused */
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list_add(&req->rq_list, &xprt->free);
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}
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rpc_wake_up_next(&xprt->backlog);
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spin_unlock(&xprt->reserve_lock);
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}
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