Re: [PATCH] dax/device: defer publishing the dynamic pgmap

[Andrew Morton]

On Sun, 27 Sep 2026 19:47:36 +0800 Jiale Yao <yaojiale02@xxxxxxx> wrote:

> The dynamic device-dax probe path publishes its devm-allocated pgmap
> before several operations that can still fail.  If one of them fails,
> devres frees the pgmap while dev_dax->pgmap remains non-NULL.  A later
> bind then fails the dynamic-dax invariant check and leaves the device
> unusable until its region is recreated.
> 
> Defer assigning dev_dax->pgmap until the final devm action has been
> installed and probe can no longer fail.  A failed probe then never
> publishes the temporary pgmap.

lgtm, thanks.

> Fixes: fc65c4eb0b2a ("device-dax: ensure dev_dax->pgmap is valid for dynamic devices")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>

I'll queue this for next-merge-window as it doesn't seem very urgent. 
Retaining cc:stable.  I've marked it as "needs maintainer acks".