Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755201AbcKBBGI (ORCPT ); Tue, 1 Nov 2016 21:06:08 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:33128 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755048AbcKBBGF (ORCPT ); Tue, 1 Nov 2016 21:06:05 -0400 From: Dongli Zhang To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Cc: davem@davemloft.net Subject: [PATCH 1/1] xen-netfront: cast grant table reference first to type int Date: Wed, 2 Nov 2016 09:04:33 +0800 Message-Id: <1478048673-26284-1-git-send-email-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.7.4 X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1399 Lines: 33 IS_ERR_VALUE() in commit 87557efc27f6a50140fb20df06a917f368ce3c66 ("xen-netfront: do not cast grant table reference to signed short") would not return true for error code unless we cast ref first to type int. Signed-off-by: Dongli Zhang --- drivers/net/xen-netfront.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 189a28d..bf2744e 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -304,7 +304,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue) queue->rx_skbs[id] = skb; ref = gnttab_claim_grant_reference(&queue->gref_rx_head); - WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)ref)); + WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); queue->grant_rx_ref[id] = ref; page = skb_frag_page(&skb_shinfo(skb)->frags[0]); @@ -428,7 +428,7 @@ static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); ref = gnttab_claim_grant_reference(&queue->gref_tx_head); - WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)ref)); + WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, gfn, GNTMAP_readonly); -- 2.7.4