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SUNRPC: Ensure we always bump the backlog queue in xprt_free_slot

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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]
This commit is contained in:
Trond Myklebust 2011-12-01 14:16:17 -05:00
parent 7fdcf13b29
commit c25573b513
1 changed files with 4 additions and 6 deletions
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10
net/sunrpc/xprt.c
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@ -995,13 +995,11 @@ static void xprt_alloc_slot(struct rpc_task *task)
static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
{
if (xprt_dynamic_free_slot(xprt, req))
return;
memset(req, 0, sizeof(*req)); /* mark unused */
spin_lock(&xprt->reserve_lock);
list_add(&req->rq_list, &xprt->free);
if (!xprt_dynamic_free_slot(xprt, req)) {
memset(req, 0, sizeof(*req)); /* mark unused */
list_add(&req->rq_list, &xprt->free);
}
rpc_wake_up_next(&xprt->backlog);
spin_unlock(&xprt->reserve_lock);
}