[PATCH v2] dmaengine: stm32-dma: Fix unchecked deference of chan->desc

[Vinod Koul]

On Mon, Dec 07, 2015 at 12:00:28PM +0100, M'boumba Cedric Madianga wrote:
> 'commit d8b468394fb7 ("dmaengine: Add STM32 DMA driver")' leads to the
> following Smatch complaint:
> 
> drivers/dma/stm32-dma.c:562 stm32_dma_issue_pending()
>     error: we previously assumed 'chan->desc' could be null (see line 560)
> 
> So, this patch fixes the unchecked dereference of chan->desc by returning
> operation not permitted error when stm32_dma_start_transfer() does not
> succeed to allocate a virtual channel descriptor.

Applied, thanks

-- 
~Vinod