From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753855AbcG2VCQ (ORCPT <rfc822;w@1wt.eu>);
	Fri, 29 Jul 2016 17:02:16 -0400
Received: from mail-pf0-f180.google.com ([209.85.192.180]:33292 "EHLO
	mail-pf0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752846AbcG2VCO (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 29 Jul 2016 17:02:14 -0400
Date: Fri, 29 Jul 2016 14:02:24 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: Amir Levy <amir.jer.levy@intel.com>
Cc: andreas.noever@gmail.com, gregkh@linuxfoundation.org, bhelgaas@google.com,
        corbet@lwn.net, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org, netdev@vger.kernel.org,
        linux-doc@vger.kernel.org, thunderbolt-linux@intel.com,
        mika.westerberg@intel.com, tomas.winkler@intel.com
Subject: Re: [PATCH v5 4/8] thunderbolt: Communication with the ICM
 (firmware)
Message-ID: <20160729140224.137dbaac@xeon-e3>
In-Reply-To: <1469693721-5641-5-git-send-email-amir.jer.levy@intel.com>
References: <1469693721-5641-1-git-send-email-amir.jer.levy@intel.com>
	<1469693721-5641-5-git-send-email-amir.jer.levy@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, 28 Jul 2016 11:15:17 +0300
Amir Levy <amir.jer.levy@intel.com> wrote:

> +static LIST_HEAD(controllers_list);
> +static DECLARE_RWSEM(controllers_list_rwsem);

Why use a semaphore when simple spinlock or mutex would be better?