linux-kernel - Re: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200615143622.GX4447@sirena.org.uk>
Date:   Mon, 15 Jun 2020 15:36:22 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "matthias.schiffer@...tq-group.com" 
        <matthias.schiffer@...tq-group.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

On Mon, Jun 15, 2020 at 02:18:54PM +0000, Robin Gong wrote:
> On 2020/06/15 21:39 Mark Brown <broonie@...nel.org> wrote:
> > On Mon, Jun 15, 2020 at 01:35:01PM +0000, Robin Gong wrote:

> > > Then how about choosing specific error code for such dma not ready
> > > case where nothing went out on the bus neither?

> > Yes, that's what I suggested.

> Seems not easy to find a suitable error value, how about EBADR which
> sounds like no any available dma_async_tx_descriptor got by calling dmaengine_prep_slave_sg? 

> #define EBADR           53      /* Invalid request descriptor */

We could also pass in a flag that could be set separately to the error
code to indicate that nothing had happened to the hardware yet.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)