From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [PATCH] of/device: Really only set bus DMA mask when appropriate Date: Wed, 7 Nov 2018 09:52:35 -0600 Message-ID: <20181107155235.GA18618@bogus> References: <20181107080335.GA24511@lst.de> <22cbe798-612f-8c88-90e7-388202f603cf@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <22cbe798-612f-8c88-90e7-388202f603cf-5wv7dgnIgG8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Robin Murphy Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, aaro.koskinen-X3B1VOXEql0@public.gmane.org, jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org, linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, Christoph Hellwig , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org On Wed, Nov 07, 2018 at 12:56:49PM +0000, Robin Murphy wrote: > On 2018-11-07 8:03 am, Christoph Hellwig wrote: > > On Tue, Nov 06, 2018 at 11:54:15AM +0000, Robin Murphy wrote: > > > of_dma_configure() was *supposed* to be following the same logic as > > > acpi_dma_configure() and only setting bus_dma_mask if some range was > > > specified by the firmware. However, it seems that subtlety got lost in > > > the process of fitting it into the differently-shaped control flow, and > > > as a result the force_dma==true case ends up always setting the bus mask > > > to the 32-bit default, which is not what anyone wants. > > > > > > Make sure we only touch it if the DT actually said so. > > > > This looks good, but I think it could really use a comment as the use > > of ret all the way down the function isn't exactly obvious. > > Fair point. > > > Let me now if you want this picked up through the OF or DMA trees. > > I don't mind either way; I figure I'll wait a bit longer to see if Rob has > any preference, then resend with the comment and the tags picked up so it > can hopefully make rc2. I have other fixes to send, so I can take it. Rob