From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe Perches Subject: Re: [PATCH] net: consolidate lock/unlock into unlock_wait Date: Fri, 18 Mar 2016 15:35:18 -0700 Message-ID: <1458340518.26915.30.camel@perches.com> References: <1458293525-16842-1-git-send-email-hofrat@osadl.org> <20160318.173702.788700055531273267.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: David Miller , hofrat@osadl.org Return-path: In-Reply-To: <20160318.173702.788700055531273267.davem@davemloft.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Fri, 2016-03-18 at 17:37 -0400, David Miller wrote: > From: Nicholas Mc Guire > > The spin_lock()/spin_unlock() is synchronizing on the adapter->work_lock > > as the comment also suggests, which is equivalent to spin_unlock_wait() > > but the later should be more efficient. [] > There really is no justification for this change. > This is an optimization in a slow-path of the driver. > The device is a rarely used older piece of hardware. It really might be nice to take some of the ancient hardware drivers in drivers/net and move them into some separate subdirectory like: drivers/net/ancient or drivers/net/antiques or drivers/net/archaic etc... so there's some clear designation that these crufty old drivers don't need to be touched anymore except for maybe when kernel wide changes occur.