From b68757341d8015d28e261990deea58dd836e04da Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 8 Sep 2014 08:03:58 +0900 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- mm/backing-dev.c | 10 ++-------- 1 file 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); -- 2.30.2