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dax: Avoid losing wakeup in dax_lock_mapping_entry 

After calling get_unlocked_entry(), you have to call
put_unlocked_entry() to avoid subsequent waiters losing wakeups.

Fixes: c2a7d2a115 ("filesystem-dax: Introduce dax_lock_mapping_entry()")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2018-11-16 15:50:02 -05:00
parent 0e40de0338
commit 25bbe21bf4
1 changed files with 1 additions and 0 deletions
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fs/dax.c
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@ -391,6 +391,7 @@ bool dax_lock_mapping_entry(struct page *page)
rcu_read_unlock(); rcu_read_unlock();
entry = get_unlocked_entry(&xas); entry = get_unlocked_entry(&xas);
xas_unlock_irq(&xas); xas_unlock_irq(&xas);
put_unlocked_entry(&xas, entry);
rcu_read_lock(); rcu_read_lock();
continue; continue;
} }