From: Ira Snyder <iws@ovro.caltech.edu>
Date: Thu, 3 Mar 2011 07:54:59 +0000 (+0000)
Subject: fsldma: support async_tx dependencies and automatic unmapping
X-Git-Tag: v2.6.39-rc1~203^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c4d1e7bdeb1ed4dc0c3341d40662a6fbc5f2dc2;p=pandora-kernel.git

fsldma: support async_tx dependencies and automatic unmapping

Previous to this patch, the dma_run_dependencies() function has been
called while holding desc_lock. This function can call tx_submit() for
other descriptors, which may try to re-grab the lock. Avoid this by
moving the descriptors to be cleaned up to a temporary list, and
dropping the lock before cleanup.

At the same time, add support for automatic unmapping of src and dst
buffers, as offered by the DMAEngine API.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

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