dm kcopyd: avoid spin_lock_irqsave from process context
The functions "pop", "push_head", "do_work" can only be called from process context. Therefore, replace spin_lock_irq{save,restore} with spin_{lock,unlock}_irq. Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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