On Mon, Nov 14, 2016 at 06:47:31AM -0800, Tony Lindgren wrote:
> 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.
Indeed, but before
"dma: cppi41: Fix unpaired pm runtime when only a USB hub is
connected"
from last week, the corresponding put in cppi41_irq() was done
unconditionally and would have required an unconditional get here.
Thanks,
Johan
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