From 3cbe01a94c7b369f943f8a9d40394198d757cdd4 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Mon, 17 Mar 2014 13:10:05 -0400 Subject: [PATCH] svcrdma: fix offset calculation for non-page aligned sge entries The xdr_off value in dma_map_xdr gets passed to ib_dma_map_page as the offset into the page to be mapped. This calculation does not correctly take into account the case where the data starts at some offset into the page. Increment the xdr_off by the page_base to ensure that it is respected. Cc: Tom Tucker Signed-off-by: Jeff Layton Signed-off-by: J. Bruce Fields --- net/sunrpc/xprtrdma/svc_rdma_sendto.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index 11e90f8c0fc5..7e024a51617e 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -265,6 +265,7 @@ static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt, xdr_off -= xdr->head[0].iov_len; if (xdr_off < xdr->page_len) { /* This offset is in the page list */ + xdr_off += xdr->page_base; page = xdr->pages[xdr_off >> PAGE_SHIFT]; xdr_off &= ~PAGE_MASK; } else { -- 2.34.1