On Fri, Jun 14, 2019 at 6:49 AM Fabio Estevam <festevam@xxxxxxxxx> wrote:
>
> According to the original report from Sven the issue started to happen
> on 5.0, so it would be good to add a Fixes tag and Cc stable so that
> this fix could be backported to 5.0/5.1 stable trees.
Good catch !
However, the issue is highly timing-dependent. It will come and go depending
on the kernel version, devicetree and defconfig. If it works for me on
4.19, that
doesn't mean the bug is gone on 4.19.
Looking at the commit history, I think the commit below possibly introduced the
issue. Until this commit, sdma_run_channel() would wait on the interrupt
before proceeding. It has been there since 4.8:
Fixes: 1d069bfa3c78 ("dmaengine: imx-sdma: ack channel 0 IRQ in the
interrupt handler")
But my knowledge of imx-sdma is non-existent, so I invite the more knowledgeable
people in this thread to take a look at this commit.
[Adding Michael Olbrich to the thread]
