Re: [PATCH] random: fix possible sleeping allocation from irq context

Theodore Ts'o wrote:

We can do a sleeping allocation from an irq context when CONFIG_NUMA is enabled. Fix this by initializing the NUMA crng instances in a workqueue.

Offloading to workqueue context itself would be OK, but this patch makes linux.git unbootable because

if (crng == &primary_crng && crng_init < 2) { invalidate_batched_entropy(); numa_crng_init(); // <= Deferred to workqueue context. crng_init = 2; // <= Not waiting for workqueue context, and oops before console becomes ready. ;-) process_random_ready_list(); wake_up_interruptible(&crng_init_wait); pr_notice("random: crng init done\n"); }

Please don't pretend rng_ready() before workqueue context is processed.