linux-kernel - [PATCH v2 1/2] dmaengine: Clarify device parameter for dma_sync_*_for

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: <1405094182-13962-1-git-send-email-geert+renesas@glider.be>
Date:	Fri, 11 Jul 2014 17:56:21 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Mark Brown <broonie@...nel.org>, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Cc:	dmaengine@...r.kernel.org, linux-spi@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 1/2] dmaengine: Clarify device parameter for dma_sync_*_for_*()

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v2:
  - New
---
 Documentation/dmaengine.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt
index 879b6e31e2da..87d3f192e160 100644
--- a/Documentation/dmaengine.txt
+++ b/Documentation/dmaengine.txt
@@ -100,8 +100,10 @@ The slave DMA usage consists of following steps:
    The peripheral driver is expected to have mapped the scatterlist for
    the DMA operation prior to calling device_prep_slave_sg, and must
    keep the scatterlist mapped until the DMA operation has completed.
-   The scatterlist must be mapped using the DMA struct device.  So,
-   normal setup should look like this:
+   The scatterlist must be mapped using the DMA struct device.
+   If a mapping needs to be synchronized later, dma_sync_*_for_*() must be
+   called using the DMA struct device, too.
+   So, normal setup should look like this:
 
 	nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len);
 	if (nr_sg == 0)
-- 
1.9.1

--
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/