From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 6 Aug 2014 12:58:58 +0000 (+0200)
Subject: spi: rspi: Fix leaking of unused DMA descriptors
X-Git-Tag: omap-fixes-against-v3.17-rc3~18^2~1^2^9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3819bc8752367eae0d72fa1c473dc88ea45631a7;p=pandora-kernel.git

spi: rspi: 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>
---

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