Re: [PATCH] tpm: don't destroy chip device prematurely
From: Jason Gunthorpe
Date: Wed Oct 05 2016 - 12:37:40 EST
On Wed, Oct 05, 2016 at 06:15:26PM +0300, Jarkko Sakkinen wrote:
> The important thing is to notice that runtime PM requires the device
> to be "alive" and in the device hierarchy. It's a constraint...
There are two devices.
The chip->dev and the chip->dev.parent (aka the acpi_device)
Runtime PM is *only* attached to the chip->dev.parent - it does not
interact in any significant way with the chip->dev.
device_del is on the chip->dev. The acpi_device remains intact, and
This is why the whole patch is so confusing to me.