Re: [v3] mwifiex: fix kernel crash after shutdown command timeout

[Kalle Valo <kvalo@codeaurora.org>]

Brian Norris <briannorris@chromium.org> wrote:
> We observed a SHUTDOWN command timeout during reboot stress test due to
> a corner case firmware bug. It can lead to either a use-after-free +
> OOPS (on either the adapter structure, or the 'card' structure) or an
> abort (where, e.g., the PCI device is "disabled" before we're done
> dumping the FW).
> 
> We can avoid this by canceling/flushing the FW dump work:
> 
> (a) after we've terminated all other work queues (e.g., for processing
>     commands which could time out)
> (b) after we've disabled all interrupts (which could also queue more
>     work for us)
> (c) after we've unregistered the netdev and wiphy structures (and
>     implicitly, and debugfs entries which could manually trigger FW dumps)
> (d) before we've actually disabled the device (e.g.,
>     pci_device_disable())
> 
> Altogether, this means no card->work will be scheduled if we sync at
> a point that satisfies the above. This can be done at the beginning of
> the .cleanup_if() callback.
> 
> Signed-off-by: Brian Norris <briannorris@chromium.org>

Patch applied to wireless-drivers-next.git, thanks.

5caa7f384629 mwifiex: fix kernel crash after shutdown command timeout

-- 
https://patchwork.kernel.org/patch/9629349/

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