diff options
| author | Tejun Heo <tj@kernel.org> | 2014-09-08 08:03:58 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-08 10:00:38 -0600 |
| commit | b68757341d8015d28e261990deea58dd836e04da (patch) | |
| tree | 0ebc92ce23fe41cebe2a81733e609a9b303522a6 | |
| parent | e36f1dfce0b45d347927568efe1088821758cc3c (diff) | |
bdi: remove bdi->wb_lock locking around bdi->dev clearing in bdi_unregister()
The only places where NULL test on bdi->dev is used are
bdi_[un]register(). The functions can't be called in parallel anyway
and there's no point in protecting bdi->dev clearing with a lock.
Remove bdi->wb_lock grabbing around bdi->dev clearing and move it
after device_unregister() call so that bdi->dev doesn't have to be
cached in a local variable.
This patch shouldn't introduce any behavior difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | mm/backing-dev.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 1706cbbdf5f0..4afeefe9e365 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -402,21 +402,15 @@ static void bdi_prune_sb(struct backing_dev_info *bdi) void bdi_unregister(struct backing_dev_info *bdi) { - struct device *dev = bdi->dev; - - if (dev) { + if (bdi->dev) { bdi_set_min_ratio(bdi, 0); trace_writeback_bdi_unregister(bdi); bdi_prune_sb(bdi); bdi_wb_shutdown(bdi); bdi_debug_unregister(bdi); - - spin_lock_bh(&bdi->wb_lock); + device_unregister(bdi->dev); bdi->dev = NULL; - spin_unlock_bh(&bdi->wb_lock); - - device_unregister(dev); } } EXPORT_SYMBOL(bdi_unregister); |