linux-kernel - Re: [PATCH v2 5/7] atmel-mci: Add experimental DMA support

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 for Android: free password hash cracker in your pocket

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

Date:	Sun, 12 Oct 2008 10:44:05 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc:	kernel@...32linux.org, linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Subject: Re: [PATCH v2 5/7] atmel-mci: Add experimental DMA support

On Sun,  5 Oct 2008 18:21:28 +0200
Haavard Skinnemoen <haavard.skinnemoen@...el.com> wrote:

> This adds support for DMA transfers through the generic DMA engine
> framework with the DMA slave extensions.
> 
> The driver has been tested using mmc-block and ext3fs on several SD,
> SDHC and MMC+ cards. Reads and writes work fine, with read transfer
> rates up to 7.5 MiB/s on fast cards with debugging disabled.
> 
> Unfortunately, the driver has been known to lock up from time to time
> with DMA enabled, so DMA support is currently optional and marked
> EXPERIMENTAL. However, I didn't see any problems while testing 13
> different cards (MMC, SD and SDHC of different brands and sizes), so I
> suspect the "Initialize BLKR before sending data transfer command" fix
> that was posted earlier fixed this as well.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
> ---

Looks good, but I assume the plan is to remove this Kconfig option once
you're confident it is stable?

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

  WARNING: This correspondence is being monitored by the
  Swedish government. Make sure your server uses encryption
  for SMTP traffic and consider using PGP for end-to-end
  encryption.

Download attachment "signature.asc" of type "application/pgp-signature" (198 bytes)