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f2fs: fix out-of-order execution in f2fs_issue_flush 

In f2fs_issue_flush, due to out-of-order execution of CPU, wake_up can
be called before we insert issue_list, result in long latency of
wait_for_completion. Fix this by adding smp_mb() to force the order of
related codes.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-08-21 22:53:45 +08:00 committed by Jaegeuk Kim
parent 5f656541ff
commit 6f890df0a7
1 changed files with 4 additions and 1 deletions
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5
fs/f2fs/segment.c
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@ -549,7 +549,10 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
atomic_inc(&fcc->issing_flush);
llist_add(&cmd.llnode, &fcc->issue_list);
if (!fcc->dispatch_list)
/* update issue_list before we wake up issue_flush thread */
smp_mb();
if (waitqueue_active(&fcc->flush_wait_queue))
wake_up(&fcc->flush_wait_queue);
if (fcc->f2fs_issue_flush) {