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The easiest way to fall back to PIO, when a DMA descriptor allocation fails is to disable DMA on the controller but continue with the current request in PIO mode. This way tmio_mmc_start_dma() can become void, since it cannot be failing any more. The current version is also broken: it is testing a wrong pointer and thus failing to recognise, that a descriptor allocation wasn't successful. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org> |
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