tree 7600caa289d1517e8642d6be21d0a0cfe88c40d5
parent 95c9c1da79e59fd10ec5da3aeba22981383f7040
author Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1243075449 +0300
committer Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1243331267 +0300

UBI: fix race condition

This patch fixes a minor problem where we may fail to wake
upe the UBI background thread. This is not fatal at all,
it may just result at sligtly worse performace for a short
period of time, just because the thread will be woken up
when real I/O on the UBI starts.

Anywey, the issue is the race condition between
'ubi_attach_mtd_dev()' and 'ubi_thread()'. If we do not
serialize them, the 'wake_up_process()' call may be done
before 'ubi_thread()' went seep, but after it checked
'ubi->thread_enabled'.

This issue was spotted by Shin Hong <hongshin@gmail.com>

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>