staging: rtl8723au: Use a workqueue for command handling
Rewrite the old thread based code to use a workqueue instead. This removes a pile of complexity, locks and queues and eliminates problem that cmd handling could have been killed from userspace. This was suggested by Tejun Heo - thanks! Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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