[lkml]   [2012]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: How is dmaengine_prep_slave_single supposed to be used?
On Fri, 2012-01-27 at 15:32 +0100, Lars-Peter Clausen wrote:
> Hi,
> I've tried using dmaengine_prep_slave_single in one of my drivers an run
> into an issue, the dma_address attribute of the sg element is not
> initialized and thus the dma transfer and the DMA transfer fails.
> Quoting from Documentation/dmaengine.txt:
> The peripheral driver is expected to have mapped the scatterlist for
> the DMA operation prior to calling device_prep_slave_sg, and must
> keep the scatterlist mapped until the DMA operation has completed.
> So this is clearly not the case with dmaengine_prep_slave_single, so I'm
> wondering how is ut supposed to be used and can it work properly at all?
Yes this is broken now, I will fix this up


 \ /
  Last update: 2012-01-30 05:03    [W:0.031 / U:0.636 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site