diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index e34f5ebfc811..c102d2509a2a 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -139,6 +139,19 @@ xdr_error:					\
 	}					\
 } while (0)
 
+static void next_decode_page(struct nfsd4_compoundargs *argp)
+{
+	argp->pagelist++;
+	argp->p = page_address(argp->pagelist[0]);
+	if (argp->pagelen < PAGE_SIZE) {
+		argp->end = argp->p + (argp->pagelen>>2);
+		argp->pagelen = 0;
+	} else {
+		argp->end = argp->p + (PAGE_SIZE>>2);
+		argp->pagelen -= PAGE_SIZE;
+	}
+}
+
 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 {
 	/* We want more bytes than seem to be available.
@@ -166,16 +179,7 @@ static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 	 * guarantee p points to at least nbytes bytes.
 	 */
 	memcpy(p, argp->p, avail);
-	/* step to next page */
-	argp->pagelist++;
-	argp->p = page_address(argp->pagelist[0]);
-	if (argp->pagelen < PAGE_SIZE) {
-		argp->end = argp->p + (argp->pagelen>>2);
-		argp->pagelen = 0;
-	} else {
-		argp->end = argp->p + (PAGE_SIZE>>2);
-		argp->pagelen -= PAGE_SIZE;
-	}
+	next_decode_page(argp);
 	memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 	argp->p += XDR_QUADLEN(nbytes - avail);
 	return p;