From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bruce Richardson <bruce.richardson@intel.com>
Subject: Re: [PATCH v2] ixgbe: fix bad shift operation in
	ixgbe_set_pool_rx/tx
Date: Mon, 25 Apr 2016 11:35:44 +0100
Message-ID: <20160425103543.GA18116@bricha3-MOBL3>
References: <1460727549-4380-1-git-send-email-tomaszx.kulasek@intel.com>
 <1461339357-8048-1-git-send-email-tomaszx.kulasek@intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: wenzhuo.lu@intel.com, helin.zhang@intel.com,
 konstantin.ananyev@intel.com, dev@dpdk.org
To: Tomasz Kulasek <tomaszx.kulasek@intel.com>
Return-path: <dev-bounces@dpdk.org>
Received: from mga01.intel.com (mga01.intel.com [192.55.52.88])
 by dpdk.org (Postfix) with ESMTP id 840942946
 for <dev@dpdk.org>; Mon, 25 Apr 2016 12:35:58 +0200 (CEST)
Content-Disposition: inline
In-Reply-To: <1461339357-8048-1-git-send-email-tomaszx.kulasek@intel.com>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

On Fri, Apr 22, 2016 at 05:35:57PM +0200, Tomasz Kulasek wrote:
> Fix issue reported by Coverity.
> 
> Coverity ID 13193: Bad bit shift operation (BAD_SHIFT)
> large_shift: In expression 1 << pool, left shifting by more than 31 bits
> has undefined behavior. The shift amount, pool, is at least 32.
> 
> This patch is a rework of register addr selection logic and mask
> computation to made it more readable and avoid bit overflow when 32 bit
> value is shifted over its size for pool > 31.
> 
> Fixes: fe3a45fd4104 ("ixgbe: add VMDq support")
> 
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>

Acked-by: Bruce Richardson <bruce.richardson@intel.com>