From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 6 Jan 2009 18:38:14 +0000 (-0700)
Subject: dmaengine: provide a common 'issue_pending_all' implementation
X-Git-Tag: v2.6.29-rc1~39^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ba05622b8b143b0c95968ba59bddfbd6d2f2559;p=pandora-kernel.git

dmaengine: provide a common 'issue_pending_all' implementation

async_tx and net_dma each have open-coded versions of issue_pending_all,
so provide a common routine in dmaengine.

The implementation needs to walk the global device list, so implement
rcu to allow dma_issue_pending_all to run lockless.  Clients protect
themselves from channel removal events by holding a dmaengine reference.

Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

Reading git-diff-tree failed