From: Jonathan Corbet <corbet@lwn.net>
Date: Thu, 14 Jul 2011 21:10:44 +0000 (-0300)
Subject: [media] videobuf2: Do not unconditionally map S/G buffers into kernel space
X-Git-Tag: v3.2-rc1~112^2~278
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=297875b6a1f3910c883e4b00bb9bc3e6c3aa6ab7;p=pandora-kernel.git

[media] videobuf2: Do not unconditionally map S/G buffers into kernel space

The one in-tree videobuf2-dma-sg driver (mmp-camera) has no need for a
kernel-space mapping of the buffers; one suspects that most other drivers
would not either.  The videobuf2-dma-sg module does the right thing if
buf->vaddr == NULL - it maps the buffer on demand if somebody needs it.  So
let's not map the buffer at allocation time; that will save a little CPU
time and a lot of address space in the vmalloc range.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

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