From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH v3 21/77] ncr5380: Sleep when polling, if possible Date: Tue, 22 Dec 2015 08:12:04 +0100 Message-ID: <5678F7C4.4070205@suse.de> References: <20151222011737.980475848@telegraphics.com.au> <20151222011743.725252751@telegraphics.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20151222011743.725252751@telegraphics.com.au> Sender: linux-m68k-owner@vger.kernel.org To: Finn Thain , "James E.J. Bottomley" , Michael Schmitz , linux-m68k@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, "Martin K. Petersen" List-Id: linux-scsi@vger.kernel.org On 12/22/2015 02:17 AM, Finn Thain wrote: > When in process context, sleep during polling if doing so won't add > significant latency. In interrupt context or if the lock is held, pol= l > briefly then give up. Keep both core drivers in sync. > > Calibrate busy-wait iterations to allow for variation in chip registe= r > access times between different 5380 hardware implementations. > > Signed-off-by: Finn Thain > Reviewed-by: Hannes Reinecke Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: J. Hawn, J. Guild, F. Imend=F6rffer, HRB 16746 (AG N=FCrnberg)