[PATCH v2 2/2] drm/i915/fbdev: suspend HPD before fbdev unregistration

[Murthy, Arun R]

> HPD event after fbdev unregistration can cause registration of deferred fbdev
> which will not be unregistered later, causing use-after-free.
> To avoid it HPD handling should be suspended before fbdev unregistration.
> 
> It should fix following GPF:
> [272.634530] general protection fault, probably for non-canonical address
> 0x6b6b6b6b6b6b6b6b: 0000 [#1] PREEMPT SMP NOPTI
> [272.634536] CPU: 0 PID: 6030 Comm: i915_selftest Tainted: G     U
> 5.18.0-rc5-CI_DRM_11603-g12dccf4f5eef+ #1
> [272.634541] Hardware name: Intel Corporation Raptor Lake Client
> Platform/RPL-S ADP-S DDR5 UDIMM CRB, BIOS
> RPLSFWI1.R00.2397.A01.2109300731 09/30/2021 [272.634545] RIP:
> 0010:fb_do_apertures_overlap.part.14+0x26/0x60
> ...
> [272.634582] Call Trace:
> [272.634583]  <TASK>
> [272.634585]  do_remove_conflicting_framebuffers+0x59/0xa0
> [272.634589]  remove_conflicting_framebuffers+0x2d/0xc0
> [272.634592]  remove_conflicting_pci_framebuffers+0xc8/0x110
> [272.634595]
> drm_aperture_remove_conflicting_pci_framebuffers+0x52/0x70
> [272.634604]  i915_driver_probe+0x63a/0xdd0 [i915]
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5329
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5510
> Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>
> ---
Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>

Thanks and Regards,
Arun R Murthy
--------------------