Re: [RFC PATCH 0/3] gpu: nova-core: add basic timer subdevice implementation

[Danilo Krummrich]

On Tue, Feb 25, 2025 at 06:57:56PM -0400, Jason Gunthorpe wrote:
> The common driver shutdown process in the kernel, that is well tested
> and copied, makes the driver single threaded during the remove()
> callback.

All devres callbacks run in the same callchain, __device_release_driver() first
calls remove() and then all the devres callbacks, where we revoke the pci::Bar,
by which gets dropped and hence the bar is unmapped and resource regions are
free. It's not different to C drivers. Except that in C you don't lose access to
the void pointer that still points to the (unmapped) MMIO address.