linux-kernel - dmaengine: DMA_CTRL_ACK flag signification

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-next>] [day] [month] [year] [list]

Message-ID: <48DA2B94.3020804@atmel.com>
Date:	Wed, 24 Sep 2008 13:59:16 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	maciej.sosnowski@...el.com,
	Linux Kernel list <linux-kernel@...r.kernel.org>
CC:	dan.j.williams@...el.com,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: dmaengine: DMA_CTRL_ACK flag signification

Hi all,

I am in the process of writing a driver for an on-chip Atmel DMA engine.

I am a little confused about the use of the flag DMA_CTRL_ACK : It seems 
that it is set in most of the descriptors in use except the first or 
last of a descriptor chain. So, I cannot find where this flag is cleared.
In short, I do not see what it is used for : how must I take it into 
account in my driver (in device_prep_dma_memcpy() for instance) ?

Can you enlighten me ?

Regards,
-- 
Nicolas Ferre

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/