On Fri, Jul 18, 2025 at 1:21 PM Haiyang Zhang
[off-list ref] wrote:

From: Haiyang Zhang <haiyangz@microsoft.com>

The loop in default_device_exit_net() won't be able to properly detect the
head then stop, and will hit NULL pointer, when a driver, like hv_netvsc,
automatically moves the slave device together with the master device.

To fix this, add a helper function to return the first migratable netdev
correctly, no matter one or two devices were removed from this net's list
in the last iteration.

Cc: stable@vger.kernel.org # 5.4+

We (network maintainers) prefer a Fixes: tag, so that we can look at
the blamed patch, rather than trusting your '5.4' hint.

Without a Fixes tag, you are forcing each reviewer to do the
archeology work, and possibly completely miss your point.