spi: rspi: Fix leaking of unused DMA descriptors

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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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Geert Uytterhoeven 2014-08-06 14:58:58 +02:00 • committed by Mark Brown

parent 7d1311b93e

commit 3819bc8752

1 changed files with 58 additions and 36 deletions

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94

drivers/spi/spi-rspi.c

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