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

[Greg KH]

On Wed, Nov 28, 2018 at 10:53:44AM -0800, Dan Williams wrote:
> From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx>
> Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
> Passes the nvdimm unit test suite which exercises the lock path.

Now applied, thanks.

greg k-h