From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 6 Aug 2014 12:59:03 +0000 (+0200)
Subject: spi: sh-msiof: Fix leaking of unused DMA descriptors
X-Git-Tag: fix-v3.17-io-chain-v3~6^2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e81b59208fa4697c6c3b6eefb92892b47f8b1e7;p=pandora-kernel.git

spi: sh-msiof: Fix leaking of unused DMA descriptors

If dmaengine_prep_slave_sg() or dmaengine_submit() fail, we may leak
unused DMA descriptors.

As per Documentation/dmaengine.txt, once a DMA descriptor has been
obtained, it must be submitted. Hence:
  - First prepare and submit all DMA descriptors,
  - Prepare the SPI controller for DMA,
  - Start DMA by calling dma_async_issue_pending(),
  - Make sure to call dmaengine_terminate_all() on all descriptors that
    haven't completed.

Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

Reading git-diff-tree failed