Am Dienstag, 7. August 2018, 10:54:05 CEST schrieb Marc Zyngier:
> pm_runtime_get_if_in_use can fail: either PM has been disabled
> altogether (-EINVAL), or the device hasn't been enabled yet (0).
> Sadly, the Rockchip IOMMU driver tends to conflate the two things
> by considering a non-zero return value as successful.
>
> This has the consequence of hiding other bugs, so let's handle this
> case throughout the driver, with a WARN_ON_ONCE so that we can try
> and work out what happened.
>
> Fixes: 0f181d3cf7d98 ("iommu/rockchip: Add runtime PM support")
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
With Rockchip platforms always selecting PM
[see other longer thread in reply to the patch]
Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>
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