CAPI: Fix locking around capiminor's output queue and drop workaround_lock
Introduce outlock as a spin lock that protects capiminor's outqueue, outbytes and outskb (formerly known as ttyskb). outlock can be acquired from soft-IRQ context via capinc_write, so make it bh-safe. This finally removes the last reason for keeping the workaround lock around (which was incomplete and partly broken anyway). And as we no longer call handle_recv_skb in atomic context, gen_data_b3_resp_for can use non-atomic allocation now. Signed-off-by: NJan Kiszka <jan.kiszka@web.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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