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[HIFN]: Move command descriptor setup to seperate function
Move command descriptor setup to seperate function as preparation
for the following DMA setup fixes.
Note 1: also fix a harmless typo while moving it: sa_idx is initialized
to dma->resi instead of dma->cmdi.
Note 2: errors from command descriptor setup are not propagated back,
anymore, they can't be handled anyway and all conditions leading
to errors should be checked earlier.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>