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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-06-21 02:35:39 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2017-07-13 22:58:04 +0300
commit92ea011f7cbade821ebd56a1f70d20331c0320c8 (patch)
tree7c4665f0ede9ac710b284af7bfa965c68811127a /net
parent818a8dbe83fddff534b814a7d4e0c75b511dff2e (diff)
downloadlinux-92ea011f7cbade821ebd56a1f70d20331c0320c8.tar.xz
SUNRPC: Make slot allocation more reliable
In xprt_alloc_slot(), the spin lock is only needed to provide atomicity between the atomic_add_unless() failure and the call to xprt_add_backlog(). We do not actually need to hold it across the memory allocation itself. By dropping the lock, we can use a more resilient GFP_NOFS allocation, just as we now do in the rest of the RPC client code. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprt.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 3e63c5e97ebe..4654a9934269 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1047,13 +1047,15 @@ out:
return ret;
}
-static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags)
+static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt)
{
struct rpc_rqst *req = ERR_PTR(-EAGAIN);
if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs))
goto out;
- req = kzalloc(sizeof(struct rpc_rqst), gfp_flags);
+ spin_unlock(&xprt->reserve_lock);
+ req = kzalloc(sizeof(struct rpc_rqst), GFP_NOFS);
+ spin_lock(&xprt->reserve_lock);
if (req != NULL)
goto out;
atomic_dec(&xprt->num_reqs);
@@ -1081,7 +1083,7 @@ void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
list_del(&req->rq_list);
goto out_init_req;
}
- req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN);
+ req = xprt_dynamic_alloc_slot(xprt);
if (!IS_ERR(req))
goto out_init_req;
switch (PTR_ERR(req)) {