mmc: tmio_mmc: fix PIO fallback on DMA descriptor allocation failure

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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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This commit is contained in:

Guennadi Liakhovetski 2010-11-11 12:19:47 +01:00 • committed by Chris Ball

parent 729b0c79c2

commit ef17fee1e5

2 changed files with 25 additions and 46 deletions

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69

drivers/mmc/host/tmio_mmc.c

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2

drivers/mmc/host/tmio_mmc.h

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