iommu/rockchip: Handle errors returned from PM framework

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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: 0f181d3cf7 ("iommu/rockchip: Add runtime PM support")
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

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Marc Zyngier 2018-08-24 16:06:36 +01:00 • committed by Olof Johansson

parent 7db7a8f563

commit 3fc7c5c0cf

1 changed files with 15 additions and 6 deletions

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drivers/iommu/rockchip-iommu.c

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