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| author | David Woodhouse <David.Woodhouse@intel.com> | 2008-10-31 14:52:24 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2008-10-31 14:52:24 +0000 |
| commit | b27cf88e9592953ae292d05324887f2f44979433 (patch) | |
| tree | 9f903a17a08801197127b479429ee2e304898799 | |
| parent | f04de505e3fa322728d1a851e08bf7060b117743 (diff) | |
| download | linux-b27cf88e9592953ae292d05324887f2f44979433.tar.gz linux-b27cf88e9592953ae292d05324887f2f44979433.tar.bz2 linux-b27cf88e9592953ae292d05324887f2f44979433.zip | |
[JFFS2] Fix lack of locking in thread_should_wake()
The thread_should_wake() function trawls through the list of 'very
dirty' eraseblocks, determining whether the background GC thread should
wake. Doing this without holding the appropriate locks is a bad idea.
OLPC Trac #8615
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
| -rw-r--r-- | fs/jffs2/background.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c index 8adebd3e43c6..3cceef4ad2b7 100644 --- a/fs/jffs2/background.c +++ b/fs/jffs2/background.c @@ -85,15 +85,15 @@ static int jffs2_garbage_collect_thread(void *_c) for (;;) { allow_signal(SIGHUP); again: + spin_lock(&c->erase_completion_lock); if (!jffs2_thread_should_wake(c)) { set_current_state (TASK_INTERRUPTIBLE); + spin_unlock(&c->erase_completion_lock); D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n")); - /* Yes, there's a race here; we checked jffs2_thread_should_wake() - before setting current->state to TASK_INTERRUPTIBLE. But it doesn't - matter - We don't care if we miss a wakeup, because the GC thread - is only an optimisation anyway. */ schedule(); - } + } else + spin_unlock(&c->erase_completion_lock); + /* This thread is purely an optimisation. But if it runs when other things could be running, it actually makes things a |