dax: Fix missed wakeup in put_unlocked_entry()

commit 61c30c98ef17e5a330d7bb8494b78b3d6dffe9b8 upstream.

The condition checking whether put_unlocked_entry() needs to wake up
following waiter got broken by commit 23c84eb78375 ("dax: Fix missed
wakeup with PMD faults"). We need to wake the waiter whenever the passed
entry is valid (i.e., non-NULL and not special conflict entry). This
could lead to processes never being woken up when waiting for entry
lock. Fix the condition.

Cc: <stable@vger.kernel.org>
Link: http://lore.kernel.org/r/20190729120228.GC17833@quack2.suse.cz
Fixes: 23c84eb78375 ("dax: Fix missed wakeup with PMD faults")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/dax.c b/fs/dax.c
index 01ca13c80bb4498a43808edecaa6bb717f8717c9..7d0e99982d48ac249640e1f146744269ccbfd88d 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -267,7 +267,7 @@ static void wait_entry_unlocked(struct xa_state *xas, void *entry)
 static void put_unlocked_entry(struct xa_state *xas, void *entry)
 {
        /* If we were the only waiter woken, wake the next one */
-       if (entry && dax_is_conflict(entry))
+       if (entry && !dax_is_conflict(entry))
                dax_wake_entry(xas, entry, false);
 }