linux-kernel - Re: [RESEND] spi: davinci: Allow device tree devices to use DMA

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]

Date:   Thu, 12 Jan 2017 13:34:10 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     David Lechner <david@...hnology.com>
Cc:     Mark Brown <broonie@...nel.org>, nsekhar@...com,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND] spi: davinci: Allow device tree devices to use DMA

David Lechner <david@...hnology.com> writes:

> This allows SPI devices specified in a device tree to use DMA when the
> master controller.

Enabling DMA for spi-davinci isn't quite ready yet since this driver is
blindly using dma_map_single() on addresses passed in.  MTD seems to use
vmalloc'd buffers, which cannot be passed direclty to dma_map_single().

I thinks this driver needs an update to use spi_map_buf() to be able to
handle vmalloc'd buffers before always enabling DMA.

Kevin