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SubjectBUG, regression. usb-serial adapter broken by PM?

Recently, my usb-serial converter has become unusable. Attempts to open
the device always fail with:
open("/dev/ttyUSB0", O_RDONLY) = -1 EAGAIN (Resource temporarily unavailable)

The device is a:
ID 0c52:2101 Sealevel Systems, Inc. Serial Converter
and uses the ftdi_sio driver.

I've bisected this problem to
commit 1bfee5bc86fdaecc912e06080583eddab7263df2
Author: Alan Stern <>
Date: Sat Sep 25 23:35:00 2010 +0200

PM / Runtime: Merge synchronous and async runtime routines

I have other usb-serial converters that use other drivers and that are
unaffected. I have noticed the problem on a x86_64 machine (.config
here: and can reproduce it in kvm (with usb
passthrough, .config here:

I'll be glad to provide more info or try patches.


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