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| author | Jan Kara <jack@suse.cz> | 2011-05-08 19:09:53 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-05-08 19:09:53 -0400 |
| commit | 229309caebe4508d650bb6d8f7d51f2b116f5bbd (patch) | |
| tree | 6b9612369cac17205b21ca0b4d93ebbd25863f6d /Documentation | |
| parent | 667eff35a1f56fa74ce98a0c7c29a40adc1ba4e3 (diff) | |
| download | kernel_samsung_smdk4412-229309caebe4508d650bb6d8f7d51f2b116f5bbd.zip kernel_samsung_smdk4412-229309caebe4508d650bb6d8f7d51f2b116f5bbd.tar.gz kernel_samsung_smdk4412-229309caebe4508d650bb6d8f7d51f2b116f5bbd.tar.bz2 | |
jbd2: Fix forever sleeping process in do_get_write_access()
In do_get_write_access() we wait on BH_Unshadow bit for buffer to get
from shadow state. The waking code in journal_commit_transaction() has
a bug because it does not issue a memory barrier after the buffer is
moved from the shadow state and before wake_up_bit() is called. Thus a
waitqueue check can happen before the buffer is actually moved from
the shadow state and waiting process may never be woken. Fix the
problem by issuing proper barrier.
Reported-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions