ftdi_sio /dev/ttyUSB* error: "Resource Temporarily Unavailable"

Resource temporarily unavailable: '/dev/ttyUSB0'

The same problem is solved here as a patch
https://bugzilla.kernel.org/show_bug.cgi?id=23012

$ python2.7
Python 2.7.1 (r271:86832, Nov 28 2010, 17:12:05)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
>>> s=serial.Serial('/dev/ttyUSB0', 19200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/serial/serialutil.py", line 166, in __init__
    self.open()
  File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 175, in open
    raise SerialException("could not open port %s: %s" % (self._port, msg))
serial.serialutil.SerialException: could not open port /dev/ttyUSB0: [Errno 11] Resource temporarily unavailable: '/dev/ttyUSB0'

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.37-8-generic-pae 2.6.37-8.21
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.37-8.21-generic-pae 2.6.37-rc4
Uname: Linux 2.6.37-8-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices: aplay: device_list:235: no soundcards found...
Architecture: i386
ArecordDevices: arecord: device_list:235: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] Nie ma takiego pliku ani katalogu
CheckboxSubmission: 4e191d6419f992c8132165d500b5f160
CheckboxSystem: daed2f3d6643b4a84b4520a2427f8c2b
Date: Thu Dec 9 07:09:11 2010
HibernationDevice: RESUME=UUID=7c58b617-988e-46d5-9fcf-191a0c6f0511
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. 945P-S3
ProcEnviron:
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-8-generic-pae root=UUID=d8e44d2e-be67-48f1-ae7e-25a2ea39ff58 ro nokms
RelatedPackageVersions: linux-firmware 1.40
RfKill:

SourcePackage: linux
dmi.bios.date: 06/05/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F7c
dmi.board.name: 945P-S3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF7c:bd06/05/2008:svnGigabyteTechnologyCo.,Ltd.:pn945P-S3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn945P-S3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: 945P-S3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.