On Tuesday, November 8, 2016 8:18:04 AM CET Christophe JAILLET wrote:

Le 07/11/2016 à 14:50, Arnd Bergmann a écrit :

quoted

On Tuesday, November 1, 2016 8:03:33 AM CET Christophe JAILLET wrote:

quoted

'dmaengine_prep_dma_cyclic()' does not return an error pointer, so the test
can be simplified to be more consistent.

Signed-off-by: Christophe JAILLET <redacted>

The change looks correct in principle. It would be good to automate looking
for other instances of this bug. How did you find it? Do you have e.g. a
coccinelle script or did you just stumble over the issue by accident?

Hi,

You can have an idea of the strategy used in this post:
    https://lkml.org/lkml/2016/11/1/388

Julia is currently working on a more complete strategy in order to find 
such issues.

Ah, very nice!

	Arnd