powerpc: "unable to handle .. paging request" during IPR probe

[John Rose]

Anyone else seen this crash during boot on pseries?  This is 2.6.19-rc4
with 4k pages.

Unable to handle kernel paging request for data at address 0x00000010
Faulting instruction address: 0xc00000000006a204
cpu 0x1: Vector: 300 (Data Access) at [c00000006ff82bc0]
pc: c00000000006a204: .flush_workqueue+0x24/0xec
lr: c0000000003848f4: .ata_port_flush_task+0x5c/0x12c
sp: c00000006ff82e40
msr: 8000000000009032
dar: 10
dsisr: 40000000
current = 0xc000000002e3d810
paca = 0xc000000000602700
pid = 1, comm = swapper
enter ? for help
[c00000006ff82ed0] c0000000003848f4 .ata_port_flush_task+0x5c/0x12c
[c00000006ff82f60] c000000000384c78 .ata_exec_internal+0x28c/0x458
[c00000006ff83070] c000000000385070 .ata_dev_read_id+0x12c/0x2f8
[c00000006ff83150] c000000000385bfc .ata_bus_probe+0x180/0x330
[c00000006ff83210] c0000000003912ac .ata_sas_port_init+0x4c/0x6c
[c00000006ff832a0] c0000000003675a4 .ipr_ata_slave_alloc+0x68/0xc0
[c00000006ff83330] c000000000346750 .scsi_alloc_sdev+0x1d0/0x25c
[c00000006ff833e0] c0000000003477c8 .scsi_probe_and_add_lun+0x110/0x2ec
[c00000006ff834b0] c00000000034833c .__scsi_scan_target+0xd8/0x150
[c00000006ff83560] c000000000348518 .scsi_scan_channel+0x7c/0xe0
[c00000006ff83600] c000000000348648 .scsi_scan_host_selected+0xcc/0x13c
[c00000006ff836a0] c00000000036e6dc .ipr_probe+0xe0/0x158
[c00000006ff83740] c00000000024da10 .pci_call_probe+0x104/0x168
[c00000006ff83800] c00000000024dad0 .__pci_device_probe+0x5c/0x8c
[c00000006ff83880] c00000000024db38 .pci_device_probe+0x38/0x6c
[c00000006ff83910] c0000000002be40c .really_probe+0x78/0x1a4
[c00000006ff839b0] c0000000002be660 .driver_probe_device+0xfc/0x12c
[c00000006ff83a50] c0000000002be818 .__driver_attach+0xa0/0x12c
[c00000006ff83ae0] c0000000002bd240 .bus_for_each_dev+0x70/0xc0
[c00000006ff83b90] c0000000002be8cc .driver_attach+0x28/0x40
[c00000006ff83c10] c0000000002bdb7c .bus_add_driver+0x90/0x154
[c00000006ff83cb0] c0000000002befcc .driver_register+0xa8/0xc4
[c00000006ff83d30] c00000000024e06c .__pci_register_driver+0x88/0xc0
[c00000006ff83db0] c0000000005c6a2c .ipr_init+0x34/0x4c
[c00000006ff83e30] c00000000059fb20 .do_initcalls+0x9c/0x19c
[c00000006ff83f00] c000000000009294 .init+0x94/0x1a8
[c00000006ff83f90] c000000000025540 .kernel_thread+0x4c/0x68