pci regression: "panic: resource_list_alloc: resource entry is busy"

[Michael Butler]

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Post SVN rev 189306 on my Toshiba laptop, I get a bootstrap panic as
follows:

vgapci0: <VGA-compatible display> port 0x1800-0x1807
	mem 0xf0a00000-0xf0a7ffff,0xd0000000-0xdfffffff,
	0xf0b00000-0xf0b3ffff
	irq 16 at device 2.0 on pci0
acpi_video0: <ACPI video extension> on vgapci0
	found VGA CRT or VESA Compatible Analog Monitor(100), idx#0,
	port#0, detectable by BIOS, head #0
	found TV/HDTV or Analog-Video Monitor(200), idx#0,
	port#0, detectable by BIOS, head #0
	found Internal/Integrated Digital Flat Panel(400), idx#0,
	port#0, detectable by BIOS, head #0
agp0: <Intel 82945GM (945GM GMCH) SVGA controller> on vgapci0
vgapci0: Reserved 0x10000000 bytes for rid 0x18 type 3 at 0xd0000000
vgapci0: Reserved 0x80000 bytes for rid 0x10 type 3 at 0xf0a00000
vgapci0: Reserved 0x40000 bytes for rid 0x1c type 3 at 0xf0b00000
agp0: detected 7932k stolen memory
agp0: aperture size is 256M
drm0: <Intel i945GM> on vgapci0

<<< fails here with "panic: resource_list_alloc: resource entry is busy"

vgapci0: Reserved 0x80000 bytes for rid 0x10 type 3 at 0xf0a00000
vgapci0: child drm0 requested pci_enable_busmaster
info: [drm] AGP at 0xd0000000 256MB
info: [drm] Initialized i915 1.6.0 20080730
vgapci1: <VGA-compatible display> mem 0xf0a80000-0xf0afffff at
	device 2.1 on pci0

Presumably, the agp/drm interaction with vgapci resources prompts this :-(

	Michael
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