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| author | Shin Hong <hongshin@gmail.com> | 2009-06-10 20:11:29 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-06-10 20:11:29 -0400 |
| commit | fd0fb038d5a308c7faddd1701be5e70aaffec98b (patch) | |
| tree | 50b0f3cda5a957bad1090ec4d7bd4e49f43171da | |
| parent | 4eedeb75e7f15ffdb12d1ad559b565e7505bdbaf (diff) | |
| download | op-kernel-dev-fd0fb038d5a308c7faddd1701be5e70aaffec98b.zip op-kernel-dev-fd0fb038d5a308c7faddd1701be5e70aaffec98b.tar.gz | |
Btrfs: init worker struct fields before kthread-run
This patch fixes a bug which may result race condition
between btrfs_start_workers() and worker_loop().
btrfs_start_workers() executed in a parent thread writes
on workers->worker and worker_loop() in a child thread
reads workers->worker. However, there is no synchronization
enforcing the order of two operations.
This patch makes btrfs_start_workers() fill workers->worker
before it starts a child thread with worker_loop()
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/async-thread.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index 502c3d6..7f88628 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -294,10 +294,10 @@ int btrfs_start_workers(struct btrfs_workers *workers, int num_workers) INIT_LIST_HEAD(&worker->worker_list); spin_lock_init(&worker->lock); atomic_set(&worker->num_pending, 0); + worker->workers = workers; worker->task = kthread_run(worker_loop, worker, "btrfs-%s-%d", workers->name, workers->num_workers + i); - worker->workers = workers; if (IS_ERR(worker->task)) { kfree(worker); ret = PTR_ERR(worker->task); |
