linux-kernel - Re: [4.19-stable PATCH] dax: Avoid losing wakeup in dax_lock_mapping

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Message-ID: <20181129080430.GB13859@kroah.com>
Date:   Thu, 29 Nov 2018 09:04:30 +0100
From:   Greg KH <greg@...ah.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     stable@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: 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@...radead.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@...r.kernel.org>
> Signed-off-by: Matthew Wilcox <willy@...radead.org>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
> Passes the nvdimm unit test suite which exercises the lock path.

Now applied, thanks.

greg k-h