I am sorry, there was a mistake in my bisect (there seems to be some
race conditions between the scsi/usb storage behaviour and the usb
serial behaviour that very rarely makes a "bad" kernel work or a "good"
kernel not to work)
However the regression still intervenes with a change in the SCSI cdrom
driver code (drivers/scsi/sr.c)
commit 93aae17af1172c40c6f74b7294e93a90c3cfaa5d
Author: Tejun Heo <t...@kernel.org>
Date: Thu Dec 16 17:52:17 2010 +0100
sr: implement sr_check_events()
Replace sr_media_change() with sr_check_events(). It normally only
uses GET_EVENT_STATUS_NOTIFICATION to check both media change and
eject request. If @clearing includes DISK_EVENT_MEDIA_CHANGE, it
issues TUR and compares whether media presence has changed. The SCSI
specific media change uevent is kept for compatibility.
sr_media_change() was doing both media change check and revalidation.
The revalidation part is split into sr_block_revalidate_disk().
The difficulty is that it is possible that it is not something called
from sr_check_events that causing the regression, but something
triggered in drivers/cdrom/cdrom.c by the new presence of a
->check_events in the device operations structure.
>From my tests, upstream is affected too, even in HEAD (so the recent
>79b9677d885d1a792bc103f2febb06f91f92de43 commit evoked above does not solve
>it). I have not (yet) opened a bug report upstream.
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Title:
Kernel in Natty disconnects Huawei E160G, ModemManager can't use it
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