dmaengine: dw: lazy allocation of dma descriptors

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This patch changes the driver to allocate DMA descriptors when
needed. This stops memory resources to be wasted and letting
them sit idle in the free_list structure when the device doesn't
need it... This also solves the problem, that a driver has to
guess the number of how many descriptors it needs to allocate
in advance. Currently, the dma engine will just fail when put
under load by sata_dwc_460ex.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

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Christian Lamparter 2016-04-14 18:11:01 +02:00 • committed by Vinod Koul

parent 925a7d045e

commit ab703f818a

2 changed files with 48 additions and 119 deletions

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168

drivers/dma/dw/core.c

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1

drivers/dma/dw/regs.h

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