Messages in this thread | | | Date | Mon, 4 May 2015 08:03:46 +0200 | From | Nicholas Mc Guire <> | Subject | Re: [PATCH 2/4] mtd: sh_flctl: drop unused variable |
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On Mon, 04 May 2015, Vinod Koul wrote:
> On Sun, May 03, 2015 at 10:33:43PM +0300, Laurent Pinchart wrote: > > Hi Nicholas, > > > > Thank you for the patch. > > > > On Saturday 02 May 2015 09:57:08 Nicholas Mc Guire wrote: > > > shdma_tx_submit() called via dmaengine_submit() returns the assigned > > > cookie but this is not used here so the variable and assignment can > > > be dropped. > > > > > > Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org> > > > > I would rephrase the commit message to avoid mentioning shdma_tx_submit() as > > that's not relevant. Something like "dmaengine_submit() returns the assigned > > cookie but this is not used here so the variable and assignment can be > > dropped." > And I am bit surrised about taht. Ideally the driver should use the cookie > to check the status later on... > looking at other drivers it seems like the drivers should call dma_submit_error(cookie); on the received cookie - which does: return cookie < 0 ? cookie : 0; but doing that after dmaengine_submit() which actually already queued the this request in shdma_base.cc:shdma_tx_submit() might not be that helpful and looking at dma_cookie_assign() I do not see how the condition that dma_submit_error is checking for ever could occur as it can't go below cookie = DMA_MIN_COOKIE which is defined to 1 (include/linux/dmaengine.h)
As other drivers seem to not be doing more with the returned cookie than calling dma_submit_error() on it this seems ok here ...but I'm not that deep into this - my starting point was a simple API inconsisteny in the use of wait_for_completion_timeout() :)
thx! hofrat
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