From d097e5b5a1bc3cc601f11b61455210414c4f8b59 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 4 May 2018 15:35:46 -0400 Subject: [PATCH] xprtrdma: Return -ENOBUFS when no pages are available commit a8f688ec437dc2045cc8f0c89fe877d5803850da upstream. The use of -EAGAIN in rpcrdma_convert_iovs() is a latent bug: the transport never calls xprt_write_space() when more pages become available. -ENOBUFS will trigger the correct "delay briefly and call again" logic. Fixes: 7a89f9c626e3 ("xprtrdma: Honor ->send_request API contract") Signed-off-by: Chuck Lever Cc: stable@vger.kernel.org # 4.8+ Signed-off-by: Anna Schumaker Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/xprtrdma/rpc_rdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index 491ae9f..991d5a9 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -229,7 +229,7 @@ rpcrdma_convert_iovs(struct rpcrdma_xprt *r_xprt, struct xdr_buf *xdrbuf, */ *ppages = alloc_page(GFP_ATOMIC); if (!*ppages) - return -EAGAIN; + return -ENOBUFS; } seg->mr_page = *ppages; seg->mr_offset = (char *)page_base; -- 2.7.4