CAPI: Rework capi_ctr_ready/down
This step prepares the application of proper controller locking: Push all state changing work into the notify handler that are called by capi_ctr_ready and capi_ctr_down, switch detach_capi_ctr to issue a synchronous ctr_down. Also ensure that we do not go through any action if the state did not change. Signed-off-by: NJan Kiszka <jan.kiszka@web.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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