powerbook/radeon PM problem

Whenever I resume my powerbook I get:

[  336.307861] BUG: sleeping function called from invalid context at kernel/rwsem.c:20
[  336.307871] in_atomic():0, irqs_disabled():1
[  336.307875] Call Trace:
[  336.307879] [EC257D30] [C000901C] show_stack+0x3c/0x194 (unreliable)
[  336.307900] [EC257D60] [C00268B8] __might_sleep+0xd4/0xe8
[  336.307918] [EC257D70] [C004555C] down_read+0x24/0x5c
[  336.307930] [EC257D90] [C003A574] blocking_notifier_call_chain+0x20/0x54
[  336.307940] [EC257DB0] [C017FB60] fb_notifier_call_chain+0x24/0x34
[  336.307949] [EC257DC0] [C0180178] fb_set_suspend+0x58/0x6c
[  336.307956] [EC257DE0] [C01A79F0] radeonfb_pci_resume+0x1fc/0x3e0
[  336.307964] [EC257E00] [C01A7BF8] radeonfb_early_resume+0x24/0x40
[  336.307970] [EC257E20] [C001A5C0] pmac_call_early_video_resume+0x2c/0x3c
[  336.307985] [EC257E30] [C01E1148] pmu_ioctl+0x6f8/0xb64
[  336.307994] [EC257ED0] [C0091C84] do_ioctl+0x80/0x84
[  336.308003] [EC257EE0] [C0091D0C] vfs_ioctl+0x84/0x43c
[  336.308009] [EC257F10] [C0092104] sys_ioctl+0x40/0x74
[  336.308014] [EC257F40] [C00114B4] ret_from_syscall+0x0/0x38


Hence, there must be a bug somewhere... The documentation to
fb_set_suspend notes:
"It must be called with the console semaphore held"

So that's one of the bugs, how can that be satisfied when we're just
resuming and haven't taken that semaphore? (if we did take it, then we'd
get the warning earlier..)

Then again, is the resume code really supposed to be called with
interrupts disabled?

I'm totally unsure what the correct fix for this is.

johannes