Resume failing in get_cmos_time()

On around 20% of ACPI resume attempts, the resume hangs during time_resume(). I've traced this down to the get_cmos_time() call - a printk before that appears, one afterwards doesn't. The rest of the time, resume works correctly. Interestingly, this only seems to happen if I use the patch from http://bugzilla.kernel.org/show_bug.cgi?id=2643
or a similar one for the IO-APIC. Does anyone have any idea why this might result in this sort of failure mode? I'm considering just removing the call for now and resetting the clock from userspace.

Matthew Garrett | [email protected]