RE: [PATCH] drm/xe/pm: do not warn about missing runtime PM protection after hot-unplug

Hi Raag,

> -----Original Message-----
> From: Jadav, Raag <[email protected]>
> Sent: Thursday, July 30, 2026 11:29 AM
> To: Gote, Nitin R <[email protected]>
> Cc: [email protected]; Brost, Matthew <[email protected]>;
> Auld, Matthew <[email protected]>
> Subject: Re: [PATCH] drm/xe/pm: do not warn about missing runtime PM
> protection after hot-unplug
> 
> On Thu, Jul 30, 2026 at 11:06:36AM +0530, Nitin Gote wrote:
> > After hot-unplug, device_del() disables runtime PM. A deferred fd
> > close can still run later during process exit and destroy remaining
> > exec queues, which may call xe_pm_runtime_get_noresume().
> 
> This sounds like could cause many other side effects. Why not make sure the exec
> queues are taken care of as part of hot-unplug path?
> 

Here In igt@core_hotunplug@hotreplug-with-load and igt@core_hotunplug@hotunplug-rescan-with-load subtests, 
the workload keeps the DRM fd open while the device is pci hot-unplugged. Later, fd close reaches 
guc_exec_queue_destroy() -> guc_exec_queue_add_msg() -> xe_pm_runtime_get_noresume(), 
after pci_remove/device_del() path has already called pm_runtime_disable() during pci hot-unplug. 

So the WARN is a false-positive for the already-unplugged device case.
I will update the commit message to make this scope clearer.

Thank you,
Nitin

> Raag