Hi,
* Johan Hovold <johan@xxxxxxxxxx> [161114 06:35]:
> On Fri, Nov 11, 2016 at 11:28:52AM -0800, Tony Lindgren wrote:
> > If we return early on pm_runtime_get() error, we need to also call
> > pm_runtime_put_noidle() as pointed out in a musb related thread
> > by Johan Hovold <johan@xxxxxxxxxx>. This is to keep the PM runtime
> > use counts happy.
> >
> > Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
> > Cc: Johan Hovold <johan@xxxxxxxxxx>
> > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> > ---
> > drivers/dma/cppi41.c | 11 +++++++++--
> > 1 file changed, 9 insertions(+), 2 deletions(-)
>
> > @@ -466,6 +472,7 @@ static void cppi41_dma_issue_pending(struct dma_chan *chan)
> >
> > error = pm_runtime_get(cdd->ddev.dev);
> > if ((error != -EINPROGRESS) && error < 0) {
> > + pm_runtime_put_noidle(cdd->ddev.dev);
> > dev_err(cdd->ddev.dev, "Failed to pm_runtime_get: %i\n",
> > error);
>
> Will this chunk not introduce rather than fix an imbalance, though? An
> error is never returned above, and the corresponding put is done
> unconditionally as far as I can tell.
There is already an early return in cppi41_dma_issue_pending() on
error.
Regards,
Tony
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