xprtrdma: Allocate missing pagelist

GETACL relies on transport layer to alloc memory for reply buffer.
However xprtrdma assumes that the reply buffer (pagelist) has been
pre-allocated in upper layer. This problem was reported by IOL OFA lab
test on PPC.

Signed-off-by: Shirley Ma <shirley.ma@oracle.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Edward Mossman <emossman@iol.unh.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 436d229f31dc..dc4a826192b6 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -99,6 +99,12 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
         page_base = xdrbuf->page_base & ~PAGE_MASK;
         p = 0;
         while (len && n < nsegs) {
+                if (!ppages[p]) {
+                        /* alloc the pagelist for receiving buffer */
+                        ppages[p] = alloc_page(GFP_ATOMIC);
+                        if (!ppages[p])
+                                return 0;
+                }
                 seg[n].mr_page = ppages[p];
                 seg[n].mr_offset = (void *)(unsigned long) page_base;
                 seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);