Re: [4.19-stable PATCH] dax: Avoid losing wakeup in dax_lock_mapping_entry

On Wed, Nov 28, 2018 at 10:53:44AM -0800, Dan Williams wrote:

From: Matthew Wilcox willy@infradead.org

commit 25bbe21bf427a81b8e3ccd480ea0e1d940256156 upstream.

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

Fixes: c2a7d2a11552 ("filesystem-dax: Introduce dax_lock_mapping_entry()") Cc: stable@vger.kernel.org Signed-off-by: Matthew Wilcox willy@infradead.org Signed-off-by: Dan Williams dan.j.williams@intel.com

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Passes the nvdimm unit test suite which exercises the lock path.

Now applied, thanks.

greg k-h